Missouri Grease Trap Regulations (2026)
Everything a Missouri restaurant or commercial kitchen needs to know about grease trap compliance: who regulates it, how often you must clean, what records to keep, and what violations actually cost. Citations link to the official source so you can verify every claim — and show your inspector you did.
Missouri Requirements at a Glance
| Cleaning frequency | No statewide interval — Missouri adopts federal pretreatment standards and delegates enforcement to local control authorities (sewer districts/POTWs), which set the schedules. Kansas City requires the 25% rule with quarterly minimum service. |
| State regulator | Missouri Department of Natural Resources (DNR), Water Protection Program |
| Governing regulation | Missouri Clean Water Law, RSMo Chapter 644; 10 CSR 20-6.100 (adopts federal 40 CFR Part 403 pretreatment standards); 10 CSR 20-8 (design guides incl. grease trap sizing) |
| Penalties | Under the Missouri Clean Water Law (RSMo §644.076), willful or negligent violations carry fines of $2,500–$25,000 per day (up to $50,000 per day for repeat convictions), plus possible imprisonment and restoration costs. City fines apply on top. (source) |
Who Regulates Grease Traps in Missouri
At the state level, Missouri Department of Natural Resources (DNR), Water Protection Program (program page) oversees FOG (fats, oils, and grease) discharge; the governing rule is Missouri Clean Water Law, RSMo Chapter 644; 10 CSR 20-6.100 (adopts federal 40 CFR Part 403 pretreatment standards); 10 CSR 20-8 (design guides incl. grease trap sizing). Day-to-day enforcement — inspections, cleaning intervals, fines — usually happens through your city or county sewer utility's pretreatment program, which can set stricter rules than the state.
City Programs in Missouri
Cities run their own FOG programs and often set stricter rules than the state:
Kansas City
- Program: KC Water — Restaurants/FOG Program
- Ordinance: Kansas City Code of Ordinances ch. 60 (§60-132 pretreatment; §60-117 record keeping)
- Cleaning frequency: Clean when a vertical core sample is 25% solids and grease; minimum quarterly (every 90 days); high-volume kitchens more often
- Permit: Interceptors must cover all applicable drains; KC Water inspects compliance every two years
St. Louis
- Program: Metropolitan St. Louis Sewer District (MSD) FOG Program
- Ordinance: MSD Ordinance No. 8472 (Sewer Use Ordinance)
- Cleaning frequency: MSD recommends cleaning at 60% capacity; minimum every 90 days for food service establishments
- Permit: Register with MSD (Sewer Use Customer Application + Food Service Operation Form); grease trap design must be MSD-approved before installation
Worth Knowing in Missouri
Missouri runs a delegated model: DNR adopts the federal pretreatment framework (10 CSR 20-6.100) and oversees local control authorities — cities and sewer districts — which issue permits and enforce directly. There's no statewide grease-hauler license or manifest system, so requirements are entirely local. Note St. Louis MSD's recommended 60% trigger is looser than the 25% standard common elsewhere — but the statutory penalties under RSMo Chapter 644 (up to $25,000/day) are among the steepest.
Frequently Asked Questions
How often must grease traps be cleaned in Missouri?
No statewide interval — Missouri adopts federal pretreatment standards and delegates enforcement to local control authorities (sewer districts/POTWs), which set the schedules. Kansas City requires the 25% rule with quarterly minimum service. Your city's FOG program may require more frequent service — and regardless of the legal interval, clean before fats, oils, and grease reach 25% of trap capacity.
What are the penalties for grease trap violations in Missouri?
Under the Missouri Clean Water Law (RSMo §644.076), willful or negligent violations carry fines of $2,500–$25,000 per day (up to $50,000 per day for repeat convictions), plus possible imprisonment and restoration costs. City fines apply on top. Enforcement is usually municipal, so your city's fine schedule controls — the fastest way to stay off it is a maintained cleaning schedule and complete records.
Next Steps
- Find grease trap cleaning companies in Missouri
- Run the Missouri-adapted compliance checklist
- Put manifests and pricing in writing (free template)
Official Sources
- https://www.sos.mo.gov/adrules/csr/current/10csr/10csr
- https://dnr.mo.gov/water/business-industry-other-entities/permits-certification-engineering-fees/wastewater/construction-engineering/pretreatment
- https://www.revisor.mo.gov/main/OneSection.aspx?section=644.076&bid=52479
- https://www.kcwater.us/programs/restuarants-fog/
- https://msdprojectclear.org/what-we-do/stormwater-management/help/grease-interceptors/
This guide summarizes official sources for general information and is not legal advice. Rules change — confirm requirements with Missouri Department of Natural Resources (DNR), Water Protection Program and your local FOG program.
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