Clean Water Act discharge permit · NPDES COG641209
NORTHWATER TREATMENT PLANT, Golden, CO: NPDES COG641209 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 12Pollutants under a numeric limit
- 3Pollutants with an effluent exceedance
NORTHWATER TREATMENT PLANT, held by Denver Water, holds NPDES permit COG641209, which discharges to Ralston Creek And Ralston Reservoir. EPA’s file records it issued November 3, 2022 and expiring September 30, 2023. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | NORTHWATER TREATMENT PLANT |
|---|---|
| Permittee as filed | Denver Water |
| NPDES ID | COG641209 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | November 3, 2022 |
| Expiration date | September 30, 2023 |
| Address | Golden, CO 80403 |
| Receiving water | Ralston Creek and Ralston Reservoir |
| Subwatershed | Lower Ralston Creek (HUC 101900040304) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 12Pollutants on file
- 12Under a numeric limit
- 3With a violation of any kind
- 3With 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 |
|---|---|---|---|---|---|
| Manganese, dissolved [as Mn] | 9 | 2 | 2 | September 30, 2025 | 303% over the limit |
| pH | 18 | 1 | 1 | September 30, 2025 | |
| Aluminum, total recoverable | 18 | 1 | 1 | September 30, 2024 | 22% over the limit |
| Solids, total suspended | 18 | 0 | 0 | ||
| Manganese, potentially dissolvd | 18 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 18 | 0 | 0 | ||
| Chlorine, total residual | 18 | 0 | 0 | ||
| Oil and grease | 9 | 0 | 0 | ||
| Sulfate | 9 | 0 | 0 | ||
| Boron, total | 9 | 0 | 0 | ||
| Oil and grease visual | 9 | 0 | 0 | ||
| Nitrogen, ammonia total [as N] | 6 | 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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES COG641209.
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
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, COG641209.
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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 COG641209 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.