Missouri
Missouri Department of Natural Resources
Quick Summary
For most Missouri projects disturbing 1 acre or more, you need both a state NPDES permit and a State Land Disturbance (SDS) permit, plus a SWPPP. On-site inspectors must hold the mandatory CESSI certification.
This summary may repeat values the official source disagrees with (permit name, application method, fee). See the flagged fields below.
Construction Permit
Permit Document ↗- Permit Name
- NPDES/SDS Land Disturbance General Permit (MOR100000)
The agency's own page appears to have newer information for Permit Name than the value shown above. Both are below — treat the source as more likely current, and confirm with the agency.
- This directory publishes
- NPDES/SDS Land Disturbance General Permit (MOR100000)
- The official source indicates
- The source describes two permits: 'MO-RAxxxxx Land Disturbance Stormwater General Permit' (for general applicants) and 'MO-R100xxx Area-Wide Land Disturbance Stormwater General Permit' (for governmental jurisdictions only). Neither matches MOR100000.
- “Electronic Permitting (ePermitting) is an online tool that allows users to apply for and obtain a Missouri Land Disturbance Stormwater General Operating Permit (MO-RAxxxxx).”
- Threshold
- ≥ 1 acre of total land disturbance (or < 1 acre if part of a larger common plan of development or sale that will ultimately disturb ≥ 1 acre); also applies to any earth-disturbing activity that the Director determines has the potential to cause water quality violations
- NOI Lead Time
- Land Disturbance Permit (LDP) application and NOI must be submitted and authorization received before any land-disturbing activities begin. Missouri requires a minimum 2-business-day processing period for complete applications; applicants should allow 5–10 business days in practice
- Application Method
- Online via Missouri's Environmental Online Permitting System (myMOEnvironment portal at my.moenv.org); paper applications also accepted at MDNR regional offices
The agency's own page appears to have newer information for Application Method than the value shown above. Both are below — treat the source as more likely current, and confirm with the agency.
- This directory publishes
- Online via Missouri's Environmental Online Permitting System (myMOEnvironment portal at my.moenv.org); paper applications also accepted at MDNR regional offices
- The official source indicates
- The source states the online tool is called 'ePermitting' accessed via 'Missouri Gateway for Environmental Management (MoGEM)' portal, and explicitly states 'The department no longer processes MO-RAxxxxx paper applications.'
- “The department no longer processes MO-RAxxxxx paper applications. To access ePermitting, users will first have to register an account through the Missouri Gateway for Environmental Management (MoGEM) online portal.”
- Fee
- $75 application fee for disturbances < 5 acres; $150 for 5–10 acres; $225 for > 10 acres; annual renewal fees apply if permit coverage extends beyond one year
The agency's own page appears to have newer information for Fee than the value shown above. Both are below — treat the source as more likely current, and confirm with the agency.
- This directory publishes
- $75 application fee for disturbances < 5 acres; $150 for 5–10 acres; $225 for > 10 acres; annual renewal fees apply if permit coverage extends beyond one year
- The official source indicates
- Source lists: 1-<5 acres $500; 5-<10 acres $600; 10-25 acres $750; 25-<100 acres $1,500; 100-<500 acres $3,000; 500 acres+ $5,000
- “1 - < 5 acres $500 | 5 - < 10 acres $600 | 10 - 25 acres $750 | 25 - < 100 acres $1,500 | 100 - < 500 acres $3,000 | 500 acres + $5,000”
- Permit Expires
- February 7, 2027
SWPPP Requirements
Permit Document ↗- SWPPP Required
- Yes
- PE Cert Required
- No
- Template Available
- Yes
Inspection Requirements
Permit Document ↗- Frequency
- At least every 14 days and within 24 hours after any measurable precipitation event (defined as ≥ 0.5 inches of rainfall in a 24-hour period). Inspections must also be conducted after any snowmelt that causes a discharge.
- Rain Trigger
- Within 24 hours of any measurable precipitation event producing ≥ 0.5 inches of rainfall in a 24-hour period; also required after snowmelt causing a discharge
- Inspector Qualification
- Missouri requires that at least one Certified Erosion, Sediment and Stormwater Inspector (CESSI) be identified for each project. CESSI certification is obtained through MDNR-approved training programs (e.g., CPESC, CESSWI, or equivalent). This is a state-mandated certification requirement, making Missouri one of the more stringent states for inspector qualifications.
- Accepted Certifications
- CESSI (Certified Erosion, Sediment and Stormwater Inspector) designation REQUIRED by Missouri DNR; CPESC, CESSWI accepted as equivalents through MDNR-approved training programs
Discharge Standards
Permit Document ↗- Turbidity Limit
- No numeric NTU effluent limit in the Land Disturbance General Permit MOR100000
Post-Construction
MDNR ↗- Required
- Yes
Impaired Waterbody / TMDL Requirements
Standard ProvisionsMissouri DNR's land disturbance permit (NPDES) has standard provisions. No specific permit conditions are systematically triggered by proximity to 303(d)-listed impaired waters in the general permit; standard stormwater BMPs apply. Projects near impaired segments of the Missouri or Meramec Rivers should consult MoDNR directly for any site-specific requirements.
Program Contact
Contact Page ↗- Phone
- (573) 526-2082
State-Specific Notes
Missouri's requirement for a CESSI-certified inspector is a notable state-specific quirk — one of a minority of states mandating formal inspector credentialing. The myMOEnvironment online portal (my.moenv.org) consolidated multiple prior legacy systems. Missouri also regulates land disturbance under its state Surface Water Protection Law (Chapter 644 RSMo) in parallel with the federal NPDES program, meaning the state Land Disturbance Permit (LDP) and the NPDES general permit are issued together as a combined authorization. Projects near Outstanding State Resource Waters (OSRWs) face additional anti-degradation requirements. MDNR is renewing the MO-RAxxxxx land disturbance general permit: the current permit expires February 7, 2027. Operators with work continuing past that date must obtain a new permit on or after February 8, 2027 (effective for 5 years) and should not attempt to renew through ePermitting before February 2027, or they will receive a duplicative permit with no fee refund.