Clean Water Act discharge permit · NPDES MO0108332
LAKE CHATEAU SUBDIVISION WWTF, Columbia, MO: NPDES MO0108332 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 6Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
LAKE CHATEAU SUBDIVISION WWTF, held by Lake Chateau, Inc, holds NPDES permit MO0108332, which discharges to L. Cedar Cr.. EPA’s file records it issued November 1, 2012 and expiring October 31, 2017. 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 | LAKE CHATEAU SUBDIVISION WWTF |
|---|---|
| Permittee as filed | Lake Chateau, Inc |
| NPDES ID | MO0108332 |
| 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 |
| Issued | November 1, 2012 |
| Expiration date | October 31, 2017 |
| Issuing agency | MODNR-Water Protection Program |
| Address | Columbia, MO 65201 |
| Receiving water | L. Cedar Cr. |
| Subwatershed | Little Cedar Creek (HUC 103001021001) |
| SIC | 8641 – Civic And Social Associations |
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
- 9Pollutants on file
- 6Under a numeric limit
- 9With a violation of any kind
- 6With 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 |
|---|---|---|---|---|---|
| Nitrogen, ammonia total [as N] | 6 | 24 | 14 | September 30, 2024 | 229% over the limit |
| Chlorine, total residual | 2 | 20 | 8 | December 31, 2024 | 22,150% over the limit |
| E. coli | 0 | 16 | 6 | December 31, 2023 | 1,832% over the limit |
| E. coli, colony forming units [CFU] | 2 | 4 | 4 | September 30, 2017 | 2,250% over the limit |
| BOD, 5-day, 20 deg. C | 2 | 11 | 1 | March 31, 2014 | 2% over the limit |
| pH | 1 | 11 | 1 | June 30, 2026 | |
| Oxygen, dissolved [DO] | 0 | 20 | 0 | ||
| Solids, total suspended | 2 | 10 | 0 | ||
| Flow, in conduit or thru treatment plant | 0 | 4 | 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
- 10Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| June 4, 2025 | Permit Violations - Discharge Without a Valid Permit | ST6 |
| June 4, 2025 | Permit Violations - Unapproved Operation | ST6 |
| June 4, 2025 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| June 30, 2023 | Effluent Violations - Numeric effluent violation | ST6 |
| March 31, 2022 | Effluent Violations - Numeric effluent violation | ST6 |
| March 31, 2022 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
| November 9, 2018 | Effluent Violations - Narrative Effluent Violation | ST6 |
| November 9, 2018 | Effluent Violations - Numeric effluent violation | ST6 |
| November 9, 2018 | Permit Violations - Violation Specified in Comment | ST6 |
| November 9, 2018 | Permit Violations - Failure to Submit Timely Permit Renewal Application | 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.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.