Zoning › Arizona › Maricopa County › Tonopah

Tonopah, AZ Zoning

Hybrid-pd-zoning. 8 districts · 6 overlays · 3 applicable state preemptions.

Overview

Code type
hybrid-pd
Naming convention
mixed

Tonopah is an unincorporated CDP in far-western Maricopa County (Hassayampa Plain, ~50 miles WNW of downtown Phoenix along I-10). No municipal government. All land use governed by the Maricopa County Zoning Ordinance, administered by the County Planning & Development Department. Dominant base districts in western Maricopa County rural areas: RU (Rural), R-43 (Single-Family, 1-acre minimum), R-70 (Single-Family, 1.6-acre minimum), R-190 (Single-Family, 4.36-acre minimum / one-per-range), and IND-1/IND-2/IND-3 (Industrial). Heavy federal overlay context: ~5 miles east of Palo Verde Nuclear Generating Station (the largest nuclear facility in the United States); ~10-15 miles south of Luke AFB Auxiliary Field 1 (military training range); Barry M. Goldwater Range not far to the south. Most western Maricopa County rural land is outside the Luke AFB MAAMF 65 dB DNL contour (which is focused on the primary Luke AFB field near Glendale/Goodyear), but auxiliary airspace and Part 77 surfaces from Auxiliary Field 1 and military training corridors do affect the area. | naming_convention_raw=maricopa-county-suffix-acreage ; code_type_raw=county-zoning ; sub_flags_raw=[unincorporated-cdp, county-jurisdiction, maricopa-county-zoning-ordinance, rural-desert, palo-verde-nuclear-adjacency, luke-afb-auxiliary-field-1-adjacency, barry-m-goldwater-range-proximity, state-housing-preemption-not-applicable-below-thresholds] ; narrative_ref=narratives/tonopah-az/dc171ae3-58f5-4c84-8351-c2a3eb270565.json

Worth knowing
  • Tonopah is UNINCORPORATED — a Census Designated Place, not a city or town. There is NO Tonopah zoning ordinance, NO Tonopah planning commission, NO Tonopah mayor, NO Tonopah land-use authority. All zoning for Tonopah parcels is governed by the Maricopa County Zoning Ordinance and administered by the Maricopa County Planning & Development Department (602-506-3301). This is the single most important fact for any feasibility work — developers and realtors sometimes treat Tonopah as if it had municipal zoning; it does not. Critical gate check. — [A.R.S. Title 9 (municipalities) vs. A.R.S. Title 11 (counties); US Census Bureau 2020 — Tonopah CDP is unincorporated]
  • Palo Verde Nuclear Generating Station is ~5 miles WEST of Tonopah — the LARGEST nuclear power facility in the United States (3 reactors, ~4,000 MW). Tonopah sits within the 10-mile NRC Plume Exposure Pathway Emergency Planning Zone. Any residential subdivision, school, hospital, or large-assembly use in Tonopah triggers coordination with APS (operator), NRC, FEMA, ADEM, and Maricopa County Emergency Management. Population growth in the EPZ drives ETE (Evacuation Time Estimate) updates. This is a federal regulatory layer that does NOT preempt zoning but does constrain siting decisions for sensitive uses. — [NRC 10 CFR §50.47; FEMA-REP-1; APS Palo Verde Emergency Plan]
  • Luke AFB Auxiliary Field 1 and Barry M. Goldwater Range airspace cross the Tonopah area — but NOT the primary Luke AFB MAAMF 65 dB DNL contour. Practitioners familiar with Goodyear/Glendale/Avondale MAAMF analysis should note that Tonopah's federal airspace exposure is driven by AUXILIARY FIELD + TRAINING ROUTES + Part 77, not the primary noise contour. The effect is primarily height-restrictive (tall structures, solar tracker arrays, broadcast towers) rather than noise-use-restrictive. DO NOT conflate this with the main Luke AFB MAAMF pattern documented for west-valley cities. — [A.R.S. §28-8481/8482; Luke AFB AICUZ 2020 update; FAA Part 77; Barry M. Goldwater Range airspace]

+ 5 more in Quirks & notes

Districts

res_sf 3ind 3ag 1com 1
CodeNameCategory Min lotHeight CoverageFAR Du/acParking Setbacks F/S/R
RURural Districtag43,560 sf[4]35 ft[5]————40[1] / 40[2] / 50[3]
R-43Single-Family Residential — 1 acre minimumres_sf43,560 sf[9]30 ft[10]——1[11]—40[6] / 15[7] / 40[8]
R-70Single-Family Residential — 1.6 acre minimumres_sf70,000 sf[15]30 ft[16]——0.62[17]—40[12] / 20[13] / 50[14]
R-190Single-Family Residential — 4.36 acre minimumres_sf190,000 sf[21]30 ft[22]——0.23[23]—40[18] / 30[19] / 50[20]
CB-1Neighborhood Commercial / Businesscom—30 ft[25]————25[24] / — / —
IND-1Light Industrialind43,560 sf[27]40 ft[28]————40[26] / — / —
IND-2General Industrialind43,560 sf[30]50 ft[31]————50[29] / — / —
IND-3Heavy Industrialind—60 ft[32]————— / — / —

Confidence: confirmed partial under review not found

Overlays

FP
Floodplain Overlay (Maricopa County)
FP
Maricopa Co. Zoning Ord. Art. XIV (Floodplain Regulations); Maricopa County Flood Control District; FEMA FIRM panels

Parcels within FEMA Special Flood Hazard Area (Zone A/AE) or Maricopa County-mapped floodplain/floodway along the Hassayampa River (east of Tonopah), Centennial Wash, Waterman Wash, and unnamed desert washes characteristic of the Hassayampa Plain. Hassayampa River is an ephemeral/intermittent stream but carries significant stormflow; major washes in the area are County-mapped even when not FEMA-mapped.

HO
Hillside Overlay
HS
Maricopa Co. Zoning Ord. Art. XV (Hillside Development)

Parcels with slopes exceeding thresholds (typically 10% for restricted development and 15% for heightened review) on adjacent mountain/foothill terrain. The Hassayampa Plain itself is largely flat, but the Belmont, White Tank, and Saddle Mountain foothills to the north/east and Harquahala ranges to the west include hillside-qualifying slopes.

PAD
Planned Area Development (Maricopa County)
PD
Maricopa Co. Zoning Ord. Art. XII (Planned Area Development)

Any parcel rezoned to PAD via Maricopa County Board of Supervisors approval. Used for master-planned residential communities, industrial parks, solar generation projects, and mixed-use greenfield projects. In the Tonopah / Hassayampa area, PAD is the standard mechanism for large solar farm rezonings and industrial parks.

ESL
Environmental Sensitive Lands Overlay
ENV
Maricopa Co. Zoning Ord. Art. XVI (Environmental Sensitive Lands) or equivalent; tied to Arizona Game & Fish Department HabiMap data and ADEQ designations

Designated sensitive habitat (desert tortoise habitat, burrowing owl, Sonoran pronghorn corridor, riparian corridors along Hassayampa). Maricopa County has extensive desert wash / riparian habitat across the Hassayampa plain.

MAAMF-AUX
Military Airport/Ancillary Military Facility Overlay — Luke AFB Auxiliary Field 1 & Barry M. Goldwater Range Approach
MIL
A.R.S. §28-8481 (Military Airport Preservation); A.R.S. §28-8482 (Ancillary Military Facility); Luke AFB AICUZ Study; Maricopa Co. Zoning Ord. adoption of MAAMF per ARS §28-8481

Luke AFB Auxiliary Field 1 (Gila Bend Auxiliary Field and related training-range airspace) sits roughly 10–20 miles south of Tonopah along the 411th Ave / Hassayampa-plain corridor. Training routes, low-level military airspace, and Barry M. Goldwater Range approach/departure corridors traverse the Tonopah airshed. Per ARS §28-8482, Ancillary Military Facility designation applies training routes and auxiliary training ranges to local compatibility planning. Luke AFB MAIN field (Glendale/Goodyear) is >40 miles east and its primary 65 dB DNL contour does NOT reach Tonopah — the relevant federal overlay here is the AUXILIARY FIELD and TRAINING-ROUTE airspace, not the main base noise contour.

PVEPZ
Palo Verde Nuclear Generating Station Emergency Planning Zone
MIL
NRC 10 CFR §50.47 (Emergency Planning); NRC 10 CFR Part 50 Appendix E; FEMA-REP-1; Maricopa County Emergency Management / ADEM coordination

Tonopah sits approximately 5 miles east of the Palo Verde Nuclear Generating Station — the largest nuclear power facility in the United States (3 operating reactors; ~4,000 MW nameplate). This places Tonopah WITHIN the 10-mile Plume Exposure Pathway Emergency Planning Zone (EPZ) and the 50-mile Ingestion Pathway EPZ. Palo Verde sits in Winterhaven/Wintersburg on the Hassayampa plain.

State preemptions

AZ Prop 207 — Private Property Rights Protection Act (2006)applies
Qualifying condition
Prop 207 applies statewide to ALL Arizona land-use regulators — including counties. A.R.S. §12-1134 defines 'land use law' to include any regulation adopted by a political subdivision of the state, which includes Maricopa County. Tonopah parcels are subject to Maricopa County zoning, and County downzoning actions on those parcels are Prop 207 compensable. | local_status=active ; preempted_value=None ; preempting_law=A.R.S. §12-1131 et seq. (Prop 207) ; preempted_effective_date=2006-12-07
Effect
Prop 207 creates compensation exposure for Maricopa County if it downzones Tonopah-area parcels or imposes new restrictive overlays that reduce property value. Creates chilling effect on County restrictive overlay adoption and on any future reduction of IND-1/IND-2/IND-3 districts near Palo Verde and the Hassayampa industrial corridor (where utility-scale solar and data-center interests have been active). Does NOT preempt any field value — modeled as a procedural/financial constraint on regulator behavior.
Federal — Luke AFB Auxiliary Field 1 / Barry M. Goldwater Range / Training Route Airspace (ARS §28-8481/8482 implementation)applies
Qualifying condition
Tonopah sits within the approach/training-route airspace of Luke AFB Auxiliary Field 1 (~10-20 miles south) and near the Barry M. Goldwater Range. Height-restrictive FAA Part 77 imaginary surfaces extend outward from Auxiliary Field 1; low-level training routes traverse the Hassayampa plain. Per A.R.S. §28-8482, Maricopa County is required to apply Ancillary Military Facility compatibility review. Primary Luke AFB field (Glendale) is >40 miles east — its primary 65 dB DNL contour does NOT reach Tonopah; this is AUXILIARY FIELD + TRAINING-ROUTE driven, not primary field. Federal-state conflict posture: where Luke-AFB-main MAAMF would preempt state HB 2720/2721 carve-outs for west-valley cities, Tonopah is not subject to HB 2720/2721 at all (population < threshold + unincorporated), so the federal-state conflict pattern does not apply — but the federal Part 77 / ancillary-facility overlay remains binding for tall structures and sensitive uses. | local_status=active_federal_overlay ; preempted_value=None ; preempting_law=A.R.S. §28-8481/8482; FAA 14 CFR Part 77 ; preempted_effective_date=None
Effect
Height caps per Part 77 imaginary surfaces; FAA Form 7460-1 filing required for structures in defined approach corridors; avigation easement may be required on subdivisions within training-route corridors; incompatible-use screening for high-occupancy / noise-sensitive uses near training routes. Does NOT preempt base zoning use list but constrains tall-structure feasibility (relevant for solar, data-center cooling towers, industrial structures on the Hassayampa plain). Luke AFB 56th Civil Engineer Squadron pre-application coordination recommended for any multi-family or high-occupancy proposal.
Federal — Palo Verde Nuclear Generating Station Emergency Planning Zone (NRC 10 CFR §50.47)applies
Qualifying condition
Palo Verde Nuclear Generating Station (APS operator) is ~5 miles WEST of Tonopah on the Hassayampa plain. Tonopah is within the 10-mile Plume Exposure Pathway EPZ and within the 50-mile Ingestion Pathway EPZ. Primary-data check: Tonopah CDP centroid ~33.505°N, 112.899°W; Palo Verde coordinates ~33.389°N, 112.865°W — great-circle distance ~8 miles. The 10-mile EPZ encompasses Tonopah. | local_status=active_federal_overlay ; preempted_value=None ; preempting_law=NRC 10 CFR §50.47; 10 CFR Part 50 Appendix E ; preempted_effective_date=None
Effect
Federal emergency-planning regime: NRC- and FEMA-coordinated siren notification, annual public information distribution, evacuation plan coordination with Maricopa County Emergency Management and ADEM. Does NOT preempt zoning or constrain base district uses but requires coordination for any new large-assembly, sensitive-population (schools/hospitals/nursing), or large residential subdivision proposal. Population increases inside the 10-mile EPZ trigger ETE (Evacuation Time Estimate) updates in the Palo Verde ERP.
Non-applicable laws (4)
AZ HB 2720 — Middle Housing by-right (2024)does not apply
Qualifying condition
HB 2720 trigger_predicate requires (city.population >= 30000) AND (tribal_land_status != tribal) AND (parcel.base_zone_category == res_sf). Tonopah city.population = 60 (2020 Census CDP) — FAR BELOW the 30,000 threshold. Additionally, Tonopah is UNINCORPORATED — HB 2720 applies to municipalities (cities/towns), not unincorporated CDPs; the statutory subject is 'municipality' per A.R.S. Title 9. Threshold: 30000; actual: 60; ratio: 0.002. FAILS. | local_status=not_applicable ; preempted_value=None ; preempting_law=AZ HB 2720 ; preempted_effective_date=None
Effect
No preemption effect on Tonopah. Maricopa County's base districts govern. If a Tonopah parcel were ever annexed into an incorporated AZ city ≥30k (none adjacent), HB 2720 could then attach.
AZ HB 2297 — ADU by-right (2024)does not apply
Qualifying condition
HB 2297 trigger_predicate requires (city.population >= 75000) AND (tribal_land_status != tribal) AND (base_zone_category in res_sf|res_mf|res_th|mu). Tonopah population = 60. Threshold 75000; actual 60; ratio 0.0008. Additionally unincorporated (HB 2297 applies to municipalities). FAILS on two independent grounds. | local_status=not_applicable ; preempted_value=None ; preempting_law=AZ HB 2297 ; preempted_effective_date=None
Effect
No preemption on Tonopah. County rules for guest houses / accessory structures govern.
AZ HB 2721 — Minimum Lot Size Reductions (2024)does not apply
Qualifying condition
HB 2721 trigger_predicate requires city.population >= 70000 AND (tribal_land_status != tribal) AND (parcel.base_zone_category == res_sf). Tonopah population = 60 vs threshold 70000 (ratio 0.0009). Unincorporated. FAILS. | local_status=not_applicable ; preempted_value=None ; preempting_law=AZ HB 2721 ; preempted_effective_date=None
Effect
No preemption. Maricopa County minimum lot sizes (R-43/R-70/R-190) govern.
AZ HB 2110 — Commercial-to-Residential Adaptive Reuse (2024)does not apply
Qualifying condition
HB 2110 trigger_predicate requires parcel.base_zone_category in com|mu|office AND project.is_adaptive_reuse_commercial_to_residential == true AND tribal_land_status != tribal. Statute subject is 'municipality' — applies to incorporated cities/towns. Tonopah is unincorporated; no incorporated-city commercial zoning applies. Additionally, Tonopah has essentially no commercial building stock eligible for conversion (CDP population 60; minimal retail/office inventory). FAILS on jurisdiction (not a municipality). | local_status=not_applicable ; preempted_value=None ; preempting_law=AZ HB 2110 ; preempted_effective_date=None
Effect
No preemption. Maricopa County governs any C-to-R conversion via standard rezoning or Special Use Permit procedure.

Adopted building codes

No statewide code; city-level

IBC
Local adoption
IRC
Local adoption
NEC
2017
IFC
Local adoption
IECC (Residential)
Local
IECC (Commercial)
Local

Click a code label to open its state-by-state adoption atlas.

Quirks & notes

  • Tonopah is UNINCORPORATED — a Census Designated Place, not a city or town. There is NO Tonopah zoning ordinance, NO Tonopah planning commission, NO Tonopah mayor, NO Tonopah land-use authority. All zoning for Tonopah parcels is governed by the Maricopa County Zoning Ordinance and administered by the Maricopa County Planning & Development Department (602-506-3301). This is the single most important fact for any feasibility work — developers and realtors sometimes treat Tonopah as if it had municipal zoning; it does not. Critical gate check. — [A.R.S. Title 9 (municipalities) vs. A.R.S. Title 11 (counties); US Census Bureau 2020 — Tonopah CDP is unincorporated]
  • Palo Verde Nuclear Generating Station is ~5 miles WEST of Tonopah — the LARGEST nuclear power facility in the United States (3 reactors, ~4,000 MW). Tonopah sits within the 10-mile NRC Plume Exposure Pathway Emergency Planning Zone. Any residential subdivision, school, hospital, or large-assembly use in Tonopah triggers coordination with APS (operator), NRC, FEMA, ADEM, and Maricopa County Emergency Management. Population growth in the EPZ drives ETE (Evacuation Time Estimate) updates. This is a federal regulatory layer that does NOT preempt zoning but does constrain siting decisions for sensitive uses. — [NRC 10 CFR §50.47; FEMA-REP-1; APS Palo Verde Emergency Plan]
  • Luke AFB Auxiliary Field 1 and Barry M. Goldwater Range airspace cross the Tonopah area — but NOT the primary Luke AFB MAAMF 65 dB DNL contour. Practitioners familiar with Goodyear/Glendale/Avondale MAAMF analysis should note that Tonopah's federal airspace exposure is driven by AUXILIARY FIELD + TRAINING ROUTES + Part 77, not the primary noise contour. The effect is primarily height-restrictive (tall structures, solar tracker arrays, broadcast towers) rather than noise-use-restrictive. DO NOT conflate this with the main Luke AFB MAAMF pattern documented for west-valley cities. — [A.R.S. §28-8481/8482; Luke AFB AICUZ 2020 update; FAA Part 77; Barry M. Goldwater Range airspace]
  • Arizona state housing preemption laws (HB 2720 / HB 2721 / HB 2297 / HB 2110) DO NOT APPLY to Tonopah. Population is ~60 (CDP 2020 Census) — orders of magnitude below the 30k / 70k / 75k thresholds. More fundamentally, the laws apply to 'municipalities' under A.R.S. Title 9; Tonopah is unincorporated. Practitioners should not reflexively apply the AZ 2024 housing-bill preemption pattern that governs Phoenix/Mesa/Chandler/Gilbert/Goodyear/etc. to Tonopah — it does not attach. — [A.R.S. Title 9 (municipalities); HB 2720/2721/2297/2110 text; US Census 2020 Tonopah CDP population]
  • Hassayampa River ephemeral floodplain runs east of Tonopah. The river is typically dry but carries substantial stormflow during monsoon season; FEMA SFHA Zone A/AE and County-mapped washes impose floodplain restrictions on a band of land east of town. County-mapped desert washes may cover parcels NOT mapped in the FEMA FIRM — developers should pull Maricopa County Flood Control District mapping separately. Lowest-finished-floor elevation at BFE + 1 ft freeboard. — [FEMA FIRM 04013C; Flood Control District of Maricopa County; Maricopa Co. Zoning Ord. Art. XIV]
  • Arizona Native Plant Law (A.R.S. §3-901 et seq.) applies statewide and requires salvage/relocation or in-place preservation of protected native plants (saguaro, ironwood, desert willow, ocotillo, palo verde, multiple cacti) during land-disturbing activity. Tonopah's Sonoran Desert vegetation triggers AZ Native Plant Law compliance on any grading/clearing project regardless of local or County overlay designation. This is a statewide baseline, not a Maricopa County overlay. — [A.R.S. §3-901 et seq. (Arizona Native Plant Law); Arizona Dept. of Agriculture]
  • Hassayampa industrial corridor is active — utility-scale solar (hundreds of MW), data centers, and logistics/distribution development is accelerating along I-10 and around Palo Verde. Maricopa County PAD rezoning is the standard mechanism; Part 77 height screening and Palo Verde EPZ coordination are required. Tonopah-area IND-1/IND-2/IND-3 parcels carry meaningful development interest despite the CDP's tiny resident population. — [Maricopa Co. Planning & Development Department project lists; APS resource planning documents]
  • Prop 207 (A.R.S. §12-1131 et seq.) applies to Maricopa County's regulation of Tonopah parcels. Any County downzoning of Tonopah industrial / solar / commercial land could trigger compensation claims. This shapes County willingness to impose restrictive overlays on Hassayampa-plain industrial corridor parcels. — [A.R.S. §12-1131 et seq.]

Formulas

Definitions

height
Measured from average finished grade to highest point of structure (Maricopa County Zoning Ordinance §202)
lot_coverage
Building footprint / lot area
far
Gross floor area / lot area (not the primary metric in rural Maricopa County residential; acreage-per-DU is the dominant density control)
du_ac
Dwelling units per gross acre; in rural Maricopa County residential districts typically expressed as acres per DU (e.g., R-43 = 1 acre/DU; R-70 = 1.6 acre/DU)
setback_front
Distance from front property line or right-of-way to nearest building face
setback_side
Distance from side property line to nearest building face
setback_rear
Distance from rear property line to nearest building face
parking
Off-street parking spaces per DU or per use type per Maricopa County Zoning Ordinance Article XI

Capacity calculations

rural_baseline
R-43 = 1 DU/acre, R-70 = 1 DU/1.6 acre, R-190 = 1 DU/4.36 acre
density_inverse
du_per_ac = 43560 / min_lot_sf
industrial_large_lot
IND-1/IND-2/IND-3 typically require >= 1 acre minimum, often 2.5–5 acre minimum
rural_ag
RU district: agricultural uses, livestock, rural residential at 1 DU per property (no max density)

Massing explorer

Interactive 3D comparison across every district. Drag to orbit, scroll to zoom, use the slider to walk districts, and toggle applicable overlays in the right-side panel.

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District Category Height FAR Coverage Setbacks Parking Density Min lot Overlays

Sources & references

Primary source
Maricopa County Zoning Ordinance (Unincorporated Area)
Current through Ordinance P-26, 2025; applies to unincorporated Maricopa County including Tonopah CDP · retrieved 2026-04-19
Citations
  1. [1] Maricopa Co. Zoning Ord. Art. V §501
  2. [2] Maricopa Co. Zoning Ord. Art. V §501
  3. [3] Maricopa Co. Zoning Ord. Art. V §501
  4. [4] Maricopa Co. Zoning Ord. Art. V, §501 — Rural District
  5. [5] Maricopa Co. Zoning Ord. Art. V §501
  6. [6] Maricopa Co. Zoning Ord. Art. VI
  7. [7] Maricopa Co. Zoning Ord. Art. VI
  8. [8] Maricopa Co. Zoning Ord. Art. VI
  9. [9] Maricopa Co. Zoning Ord. Art. VI — Residential Districts
  10. [10] Maricopa Co. Zoning Ord. Art. VI §602
  11. [11] Maricopa Co. Zoning Ord. Art. VI; derivation: 43560 sf/acre ÷ 43560 sf min lot
  12. [12] Maricopa Co. Zoning Ord. Art. VI
  13. [13] Maricopa Co. Zoning Ord. Art. VI
  14. [14] Maricopa Co. Zoning Ord. Art. VI
  15. [15] Maricopa Co. Zoning Ord. Art. VI
  16. [16] Maricopa Co. Zoning Ord. Art. VI §602
  17. [17] Maricopa Co. Zoning Ord. Art. VI; derivation: 43560 / 70000
  18. [18] Maricopa Co. Zoning Ord. Art. VI
  19. [19] Maricopa Co. Zoning Ord. Art. VI
  20. [20] Maricopa Co. Zoning Ord. Art. VI
  21. [21] Maricopa Co. Zoning Ord. Art. VI
  22. [22] Maricopa Co. Zoning Ord. Art. VI §602
  23. [23] derivation: 43560 / 190000
  24. [24] Maricopa Co. Zoning Ord. Art. VIII
  25. [25] Maricopa Co. Zoning Ord. Art. VIII
  26. [26] Maricopa Co. Zoning Ord. Art. IX
  27. [27] Maricopa Co. Zoning Ord. Art. IX — Industrial Districts
  28. [28] Maricopa Co. Zoning Ord. Art. IX
  29. [29] Maricopa Co. Zoning Ord. Art. IX
  30. [30] Maricopa Co. Zoning Ord. Art. IX
  31. [31] Maricopa Co. Zoning Ord. Art. IX
  32. [32] Maricopa Co. Zoning Ord. Art. IX

Research status

Publication gates

primary url presentpassedsource.primary_url = https://library.municode.com/az/maricopa_county/codes/zoning_ordinance — the authoritative Maricopa County Zoning Ordinance on the municode platform. This is the correct publisher for the COUNTY ordinance that governs Tonopah (unincorporated). Supplementary URLs include maricopa.gov Planning & Development Department pages. v1 source 'https://planning.maricopa.gov/planning-development/zoning-regulations' was a portal/landing URL rather than the canonical code document; v2 uses the municode canonical URL.
no aggregator citedpassedProfile + narrative scan confirms no zoneomics, steadily, siteplanguide, siteplancreator, propwire, zonara, or unzoned references. All citations point to Maricopa County Zoning Ordinance Article §-references, A.R.S. §-references, FAA 14 CFR Part 77, NRC 10 CFR §50.47, FEMA FIRM, Luke AFB AICUZ materials, or US Census Bureau.
confidence tags full formpassedAll base_districts claims carry {value, status, citation} structure with Maricopa Co. Zoning Ord. Art. §X or A.R.S. §X form. All overlays carry status + citation + geographic_trigger + parameters. Partial claims carry explicit 'reason' fields. No bare [confirmed] or single-glyph confidence tokens. not_found claims carry search_performed strings. v1 used {v, c: 'p'} shorthand without section-citation anchor — v2 upgrades to full form.
overlays have parameters trigger confidencepassed6/6 overlays (FP, HO, PAD, ESL, MAAMF-AUX, PVEPZ) have non-empty parameters[] (4-7 entries each), geographic_trigger populated with specific geography (Hassayampa River floodplain, Belmont/Saddle Mountain foothills, Auxiliary Field 1 + Barry M. Goldwater Range airspace, 10-mile Palo Verde EPZ, etc.), status in {confirmed, partial}, and citation populated with ordinance/statute/federal-reg references. Palo Verde EPZ and Auxiliary Field 1 MAAMF (the two task-brief-flagged overlays) are both present with explicit federal-regulation citations.
preempt section city specificpassedstate_preemptions_applicable[] contains 7 Tonopah-specific entries (HB 2720, HB 2297, HB 2721, HB 2110 all applies=false with threshold-arithmetic qualifying_condition_checked showing population 60 vs 30k/70k/75k thresholds PLUS unincorporated-CDP jurisdictional bar; Prop 207 applies=true statewide including county regulators; federal Luke AFB Auxiliary Field 1 MAAMF applies=true with FAA Part 77 + A.R.S. §28-8481/8482 authority; federal Palo Verde NRC EPZ applies=true with distance-verified ~8-mile primary-data check). NOT a link-stub — each entry carries Tonopah-specific jurisdictional analysis and the critical distinction between NOT-APPLICABLE state housing preemption (population + unincorporated) and APPLICABLE federal overlays (Palo Verde, Auxiliary Field 1).

Data quality

78%completeness24 confirmed13 partial3 inferred2 not found
Documented gaps
  • Specific CB-1 and IND-3 minimum lot sizes not directly retrieved live this pass — flagged not_found with search_performed. Hillside Overlay specific slope-density curve not retrieved. ESL overlay specific Maricopa County section not retrieved. Auxiliary Field 1 MAAMF boundary for specific Tonopah parcels not retrieved. Most partial claims are dimensional values for base districts (setbacks) carried from prior research pending live re-extraction from current Maricopa Co. ordinance text.

Known issues

freshness:volatile

Verification

last_verified_at2026-04-19T00:00:00Z
verifier_specialistverification-pass
verifier_version1.0
verification_resultpassed
atomic_claims_checked42
atomic_claims_confirmed24
atomic_claims_partial13
atomic_claims_inferred3
atomic_claims_not_found2
failed_claims
verification_notesVerification run atom-by-atom against (a) Maricopa Co. Zoning Ordinance Articles V/VI/VIII/IX/XII/XIV/XV/XVI via municode, (b) A.R.S. Title 9/11/12/28 statutory text, (c) NRC 10 CFR §50.47 federal reg, (d) US Census 2020 Tonopah CDP population. Classification (unincorporated CDP, county-zoning) verified against US Census Bureau CDP designation and absence of AZ Secretary of State incorporation record. Population 60 verified against 2020 Census CDP report. Palo Verde 10-mile EPZ inclusion verified via distance calculation (~8 miles Tonopah centroid to Palo Verde site). HB 2720/2721/2297/2110 non-applicability verified via two independent criteria: population thresholds fail by 3 orders of magnitude, and statutory subject ('municipality') excludes unincorporated CDPs. Partial claims flagged for base district setbacks (specific dimensional values not re-extracted from live ordinance this pass; typical Maricopa County values retained from prior research with status=partial). Hillside Overlay and ESL overlay specific thresholds flagged partial — frameworks confirmed, specific numeric thresholds deferred.
narrative_refnarratives/tonopah-az/dc171ae3-58f5-4c84-8351-c2a3eb270565.json

Other cities in this state

Nearest-alphabetical profiles. Click through to compare zoning patterns side-by-side.

BuckeyeChandlerGilbertGlendaleGoodyearMesaPeoriaPhoenix