Clean Water Act discharge permit · NPDES CO0020451
FRISCO SANITATION DISTRICT WWTF, Frisco, CO: NPDES CO0020451 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 39Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
FRISCO SANITATION DISTRICT WWTF, held by Frisco Sanitation District, holds NPDES permit CO0020451, which discharges to Miners Crk/Wetlands/Dillon Reservr. EPA’s file records it issued January 17, 2012 and expiring February 28, 2017. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | FRISCO SANITATION DISTRICT WWTF |
|---|---|
| Permittee as filed | Frisco Sanitation District |
| NPDES ID | CO0020451 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | January 17, 2012 |
| Expiration date | February 28, 2017 |
| Address | Frisco, CO 80443 |
| Receiving water | MINERS CRK/WETLANDS/DILLON RESERVR |
| Subwatershed | Dillon Reservoir (HUC 140100020401) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 43Pollutants on file
- 39Under a numeric limit
- 16With a violation of any kind
- 7With 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 |
|---|---|---|---|---|---|
| Chloride [as Cl] | 3 | 31 | 31 | January 31, 2026 | 168% over the limit |
| Zinc, potentially dissolved | 4 | 13 | 13 | January 31, 2026 | 167% over the limit |
| pH | 6 | 5 | 5 | March 31, 2024 | |
| Nitrogen, ammonia total [as N] | 72 | 3 | 3 | August 31, 2022 | 527% over the limit |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | 3 | 2 | 2 | December 31, 2023 | 52% over the limit |
| Coliform, fecal general | 0 | 2 | 2 | January 31, 2010 | 8% over the limit |
| Copper, potentially dissolved | 6 | 5 | 1 | December 31, 2021 | 37% over the limit |
| Temperature, water deg. centigrade | 4 | 40 | 0 | ||
| Manganese, dissolved [as Mn] | 0 | 7 | 0 | ||
| Nickel, total recoverable | 0 | 7 | 0 | ||
| Sulfide-hydrogen sulfide [undissociated] | 2 | 4 | 0 | ||
| Solids, total dissolved | 4 | 2 | 0 | ||
| Mercury, total [as Hg] | 2 | 2 | 0 | ||
| Phosphorus, total [as P] | 4 | 1 | 0 | ||
| Nonylphenol | 4 | 1 | 0 | ||
| Arsenic, total [as As] | 0 | 1 | 0 | ||
| BOD, 5-day, 20 deg. C | 8 | 0 | 0 | ||
| Solids, total suspended | 6 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 6 | 0 | 0 | ||
| E. coli | 4 | 0 | 0 | ||
| Arsenic, total recoverable | 3 | 0 | 0 | ||
| Iron, total recoverable | 3 | 0 | 0 | ||
| Lead, potentially dissolvd | 3 | 0 | 0 | ||
| Selenium, potentially dissolvd | 3 | 0 | 0 | ||
| Static Renewal 7 Day Chronic Pimephales promelas | 3 | 0 | 0 | ||
| Plant capacity fact. percent of capacity | 2 | 0 | 0 | ||
| Nitrogen, nitrite total [as N] | 2 | 0 | 0 | ||
| Cyanide, weak acid, dissociable | 2 | 0 | 0 | ||
| Chromium, hexavalent dissolved [as Cr] | 2 | 0 | 0 | ||
| Silver, potentially dissolved | 2 | 0 | 0 | ||
| Cadmium, potentially dissolvd | 2 | 0 | 0 | ||
| Chromium, trivalent, potentially dissolvd | 2 | 0 | 0 | ||
| Manganese, potentially dissolvd | 2 | 0 | 0 | ||
| Nickel, potentially dissolvd | 2 | 0 | 0 | ||
| Oil and grease | 2 | 0 | 0 | ||
| Chromium, trivalent total recoverable | 2 | 0 | 0 | ||
| Chlorine, total residual | 2 | 0 | 0 | ||
| BOD, 5-day, percent removal | 2 | 0 | 0 | ||
| Solids, suspended percent removal | 2 | 0 | 0 | ||
| Oil and grease visual | 2 | 0 | 0 | ||
| Molybdenum, total recoverable | 1 | 0 | 0 | ||
| LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia | 1 | 0 | 0 | ||
| LC50 Static Renewal 96Hr Acute Pimephales promelas | 1 | 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
- 1Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| July 1, 2021 | Effluent Violations - Failed Toxicity Test | 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 September 14, 2026.