Zoning › State preemptions › Missouri

Missouri Wetlands — RSMo ch. 644 Clean Water Law + §401 Water Quality Certification (MO)

Tracked preemption from the Missouri overlay bundle.

Overview

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Effective
1972-10-18
Sunset
—
Authority
state
Scope
state:MO
Other Missouri preemptions
RSMo §89.020.2 — Manufactured-Home Appearance-Criteria Preemption (Permissive-Enabling)RSMo §§ 447.700–447.718 — Missouri Brownfield Redevelopment ProgramMissouri CAFO Regulation — 10 CSR 20-6.300 (MDNR Concentrated Animal Feeding Operations)RSMo §§ 99.800–99.865 — Real Property Tax Increment Allocation Redevelopment ActRSMo §§ 305.400–305.410 — Greene County Airport Zoning Law (Springfield-Branson Region)RSMo § 253.408 — Missouri State Historic Preservation Act (SHPO)Mark Twain National Forest — USFS Adjacency & Land-Use Coordination OverlayMissouri Floodplain Management — SEMA NFIP Coordination + MDNR 10 CSR 20-8

Trigger predicate

When this evaluates true for a parcel, the law's preempted fields take precedence over base zoning.

AND
  • parcel.geometry geographic match
  • project.disturbs_waters_of_the_state == True

Preempted fields

2 fields on the base district schema are rewritten when the trigger fires.

FieldOpValueNote
review_typerequireMDNR_401_water_quality_certification_or_individual_state_permitMissouri does not operate a state-jurisdictional wetlands program parallel to the federal Section 404 program (unlike Indiana IC 13-18-22 or Wisconsin NR 103). Instead, MDNR Water Protection Program issues §401 Water Quality Certifications under the federal Clean Water Act §401 (33 U.S.C. §1341) for activities requiring federal §404 permits from the Army Corps of Engineers.
base_districts[*].wetland_impact_findingsrequireno_violation_of_state_water_quality_standards_10_CSR_20_7_031Discharges to waters of the state may not violate the state's narrative/numeric water quality standards at 10 CSR 20-7.031 (designated uses, antidegradation policy). Post-Sackett v. EPA (2023), Missouri's §401 jurisdiction depends on the federally retained WOTUS universe.

Citation

Authority source
Mo. Rev. Stat. ch. 644 (Missouri Clean Water Law); 10 C.S.R. 20-7.031 (water quality standards); 10 C.S.R. 20-6 (operating permits); federal Clean Water Act §401 (33 U.S.C. §1341)
§ Mo. Rev. Stat. §644.051 (operating permits and §401 certifications); 10 CSR 20-7.031
https://revisor.mo.gov/main/OneChapter.aspx?chapter=644

Research notes

Federal conflict check flagged because the binding regulatory program is federal §404/§401 and Missouri's role is certification/concurrence. Missouri lacks an independent state-jurisdictional wetlands statute, so post-Sackett wetlands previously regulated only because they were WOTUS (e.g., isolated prairie potholes, ephemeral playas) may now have no state or federal protection. Task brief listed 'Wetlands' as a stand-alone overlay — captured here with the correct statutory anchor (Clean Water Law §644.051) rather than a fabricated state wetlands act.