Clean Water Act discharge permit · NPDES MO0091031
MAWC, LAWSON LAGOON, Lawson, MO: NPDES MO0091031 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 10Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
MAWC, LAWSON LAGOON, held by MISSOURI-AMERICAN WATER COMPANY, holds NPDES permit MO0091031, which discharges to Brushy Creek. EPA’s file records it issued July 15, 2019 and expiring December 31, 2023. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | MAWC, LAWSON LAGOON |
|---|---|
| Permittee as filed | MISSOURI-AMERICAN WATER COMPANY |
| NPDES ID | MO0091031 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | July 15, 2019 |
| Expiration date | December 31, 2023 |
| Address | Lawson, MO 64062 |
| Receiving water | Brushy Creek |
| Subwatershed | Brushy Creek (HUC 103001010701) |
| SIC | 4952 – Sewerage Systems |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.
Effluent limits and exceedances
- 15Pollutants on file
- 10Under a numeric limit
- 10With a violation of any kind
- 5With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| pH | 2 | 28 | 13 | May 31, 2026 | |
| Nitrogen, ammonia total [as N] | 6 | 9 | 9 | June 30, 2022 | 447% over the limit |
| Solids, total suspended | 2 | 7 | 5 | June 30, 2017 | 69% over the limit |
| BOD, 5-day, 20 deg. C | 2 | 5 | 3 | May 31, 2018 | 18% over the limit |
| Ammonia [as N] + unionized ammonia | 0 | 1 | 1 | June 30, 2013 | 21% over the limit |
| Oxygen, dissolved [DO] | 0 | 16 | 0 | ||
| Phosphorus, total [as P] | 4 | 4 | 0 | ||
| Nitrogen, total [as N] | 0 | 4 | 0 | ||
| Toxicity [acute], Ceriodaphnia dubia | 0 | 1 | 0 | ||
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | 0 | 1 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 4 | 0 | 0 | ||
| Nitrite + Nitrate total [as N] | 4 | 0 | 0 | ||
| Oil and grease [soxhlet extr.] tot. | 2 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 0 | 0 | ||
| E. coli | 2 | 0 | 0 |
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 2Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| March 23, 2026 | Effluent Violations - Numeric effluent violation | ST6 |
| September 23, 2025 | Effluent Violations - Numeric effluent violation | ST6 |
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
Watch this permit
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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID MO0091031 there.
Nearby on the register
- Discharge permits in Lawson
- Every permit record in Lawson, A to Z
- Discharge permits in Missouri
- Every permit record in Missouri, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.