NPDES CO0031844 · Clean Water Act
UTSD WWTF, Estes Park, CO: NPDES CO0031844 discharge permit, effluent exceedances, inspections, penalties
UTSD WWTF, Estes Park, Colorado: Individual permit CO0031844, held by Upper Thompson Sanitation District; Publicly owned treatment works; Administratively continued; issued September 26, 2011, term to October 31, 2016; discharges to BIG THOMPSON RIVER.
10 of the 60 pollutants listed for NPDES CO0031844 have no violation or effluent exceedance.
- Copper, potentially dissolved: 8 limits, 34 violations of any kind, 26 effluent exceedances, latest June 30, 2022, largest 113% over the limit.
- pH: 4 limits, 20 violations of any kind, 14 effluent exceedances, latest August 31, 2010.
- Chlorine, total residual: 6 limits, 24 violations of any kind, 10 effluent exceedances, latest April 30, 2010, largest 8,829% over the limit.
- Silver, potentially dissolved: 8 limits, 14 violations of any kind, 4 effluent exceedances, latest June 30, 2017, largest 512% over the limit.
- Cadmium, potentially dissolvd: 8 limits, 12 violations of any kind.
- Zinc, potentially dissolved: 6 limits, 12 violations of any kind.
- Zinc, total recoverable: 0 limits, 12 violations of any kind.
- Lead, total recoverable: 0 limits, 12 violations of any kind.
- Nitrogen, ammonia total [as N]: 48 limits, 11 violations of any kind.
- BOD, 5-day, 20 deg. C: 8 limits, 11 violations of any kind.
- Cadmium, total recoverable: 0 limits, 11 violations of any kind.
- Flow, in conduit or thru treatment plant: 6 limits, 10 violations of any kind.
- Silver total recoverable: 0 limits, 10 violations of any kind.
- Lead, potentially dissolvd: 0 limits, 9 violations of any kind.
- Solids, total suspended: 6 limits, 8 violations of any kind.
- Copper, total recoverable: 0 limits, 8 violations of any kind.
- Temperature, water deg. centigrade: 4 limits, 7 violations of any kind.
- Nonylphenol: 4 limits, 6 violations of any kind.
- Manganese, potentially dissolvd: 0 limits, 6 violations of any kind.
- Coliform, fecal general: 0 limits, 6 violations of any kind.
- E. coli: 4 limits, 5 violations of any kind.
- Mercury, total [as Hg]: 5 limits, 4 violations of any kind.
- Chloride [as Cl]: 4 limits, 4 violations of any kind.
- Oil and grease: 2 limits, 4 violations of any kind.
- BOD, 5-day, percent removal: 2 limits, 4 violations of any kind.
- Solids, suspended percent removal: 2 limits, 4 violations of any kind.
- Oil and grease visual: 2 limits, 4 violations of any kind.
- Cyanide, weak acid, dissociable: 0 limits, 4 violations of any kind.
- Chromium, hexavalent dissolved [as Cr]: 0 limits, 4 violations of any kind.
- Selenium, potentially dissolvd: 0 limits, 4 violations of any kind.
- Static Renewal 7 Day Chronic Ceriodaphnia dubia: 3 limits, 3 violations of any kind.
- Static Renewal 7 Day Chronic Pimephales promelas: 3 limits, 3 violations of any kind.
- Nickel, potentially dissolvd: 0 limits, 3 violations of any kind.
- Nitrogen, inorganic total: 4 limits, 2 violations of any kind.
- Iron, dissolved [as Fe]: 4 limits, 2 violations of any kind.
- Sulfate: 4 limits, 2 violations of any kind.
- Plant capacity fact. percent of capacity: 2 limits, 2 violations of any kind.
- Arsenic, total recoverable: 2 limits, 2 violations of any kind.
- LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia: 1 limit, 2 violations of any kind.
- LC50 Static Renewal 96Hr Acute Pimephales promelas: 1 limit, 2 violations of any kind.
- Iron, total recoverable: 0 limits, 2 violations of any kind.
- Nickel, total recoverable: 0 limits, 2 violations of any kind.
- Molybdenum, total recoverable: 0 limits, 2 violations of any kind.
- Chromium, trivalent, potentially dissolvd: 0 limits, 2 violations of any kind.
- Chromium, trivalent total recoverable: 0 limits, 2 violations of any kind.
- Mercury, total low level: 0 limits, 2 violations of any kind.
- Toxicity [chronic], Ceriodaphnia dubia: 0 limits, 2 violations of any kind.
- Toxicity [chronic], Pimephales promelas [Fathead Minnow]: 0 limits, 2 violations of any kind.
- %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia: 0 limits, 2 violations of any kind.
- %Effect Static Renewal 7Day Chronic Pimephales promelas: 0 limits, 2 violations of any kind.
- Manganese, dissolved [as Mn]: 4 limits.
- Sulfide-hydrogen sulfide [undissociated]: 4 limits.
- Nitrogen, nitrite total [as N]: 3 limits.
- Nitrogen, nitrate total [as N]: 3 limits.
- Cyanide, total [as CN]: 1 limit.
- Arsenic, total [as As]: 1 limit.
- Cadmium, total [as Cd]: 1 limit.
- Chromium, total [as Cr]: 1 limit.
- Copper, total [as Cu]: 1 limit.
- Lead, total [as Pb]: 1 limit.
- January 30, 2026: Evaluation (S).
- February 23, 2022: Reporting Violations - Improper/ Incorrect Reporting (ST6).
Colorado holds 206 Publicly owned treatment works coverages of this permit type in EPA’s file; 144 were issued before CO0031844. Upper Thompson Sanitation District holds 3 permits in Colorado.
Other permits held by Upper Thompson Sanitation District
- UPPER THOMPSON SANITATION DISTRICT, Estes Park: COL031844, issued 2021-01-01
- UPPER THOMPSON SANITATION DISTRICT WWTF, Estes Park: CONOX0995, issued 2026-05-11
Coverages issued nearest CO0031844
- 2011-07-22: WELLINGTON WWTF, Wellington: CO0046451, held by Wellington Town of
- 2011-08-31: FOUNTAIN SANITATION DISTRICT WWTF, Fountain: CO0020532, held by Fountain Sanitation District
- 2011-08-31: WIDEFIELD WSD WWTF, Widefield: CO0021067, held by Widefield Water and Sanitation District
- 2011-08-31: SECURITY SANITATION DISTRICT WWTF, Fountain: CO0024392, held by Security Sanitation District
- 2011-08-31: GLENWOOD SPRINGS REGIONAL WWTF, Garfield County: CO0048852, held by Glenwood Springs City of
- 2011-09-27: MANASSA WWTF, Conejos County: CO0042935, held by Manassa Town of
- 2011-10-31: LONGMONT WWTF, Longmont: CO0026671, held by Longmont City of
- 2011-10-31: PERSIGO WWTF, Grand Junction: CO0040053, held by Mesa Co Grand Junction City of
- 2011-11-30: TRI-LAKES WWTF, Monument: CO0020435, held by Monument SD&Palmer Lake SD&Woodmoor WSD 1
- 2011-11-30: KIT CARSON WWTF, Kit Carson: CO0048858, held by Kit Carson Town of
UTSD WWTF among its neighbors
15 discharge permits are in the Lake Estes-Big Thompson River subwatershed (HUC 101900060207); CO0031844 is one. Its county: 436, 8 major; CO0031844 is major permit.
Other permits in the Lake Estes-Big Thompson River subwatershed (HUC 101900060207)
- 2024 RECLAMATION NEIGHBORHOOD, Estes Park: COR424564, minor, term to 2029-03-31
- BEAVER MEADOWS ROAD, CO FTNP ROMO 11(4), Estes Park: COR10F05R, minor, term to 2022-02-15
- BOND PARK V, Larimer County: COG074277, minor, term to 2013-09-30
- ESTES PARK HAULING FACILITY AND TRANSFER STATION, Estes Park: COR900635, minor, term to 2017-06-30
- ESTES PARK READY MIX, Estes Park: COR900250, minor, term to 2017-06-30
- ESTES PARK SANITATION DISTRICT, Estes Park: CO0020290, major, term to 2014-10-31
- HIDDEN VIEW ESTATES HOA WWTF, Larimer County: CO0048861, minor, term to 2017-02-28
- ROCKY MOUNTAIN NATIONAL PARK, Estes Park: CONOEF300, minor, term to 2021-06-17
- ROCKY MOUNTAIN NATIONAL PARK, Estes Park: COR425149, minor, term to 2029-03-31
- ROCKY MOUNTAIN NATIONAL PARK EAST HQ FUEL SYSTEM, Estes Park: COR10F06X, minor, term to 2022-02-15
Identity
| Facility | UTSD WWTF |
|---|---|
| Permittee | Upper Thompson Sanitation District |
| NPDES ID | CO0031844 |
| Status | Administratively continued |
| Type | Individual permit |
| Class | Major |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | September 26, 2011 |
| Expires | October 31, 2016 |
| Address | Estes Park, CO 80517 |
| Receiving water | BIG THOMPSON RIVER |
| Subwatershed | Lake Estes-Big Thompson River (HUC 101900060207) |
NPDES CO0031844: effluent limits and exceedances
UTSD WWTF (NPDES CO0031844): 65 pollutants on file, 43 limited; 50 with a violation of any kind, 4 with an exceedance.
The 60 with the most exceedances of the 65 on file for NPDES CO0031844. How exceedances are counted.
| Pollutant | Limits | Violations | Exceedances | Latest | Largest, as filed |
|---|---|---|---|---|---|
| Copper, potentially dissolved | 8 | 34 | 26 | June 30, 2022 | 113% over the limit |
| pH | 4 | 20 | 14 | August 31, 2010 | |
| Chlorine, total residual | 6 | 24 | 10 | April 30, 2010 | 8,829% over the limit |
| Silver, potentially dissolved | 8 | 14 | 4 | June 30, 2017 | 512% over the limit |
| Cadmium, potentially dissolvd | 8 | 12 | 0 | ||
| Zinc, potentially dissolved | 6 | 12 | 0 | ||
| Zinc, total recoverable | 0 | 12 | 0 | ||
| Lead, total recoverable | 0 | 12 | 0 | ||
| Nitrogen, ammonia total [as N] | 48 | 11 | 0 | ||
| BOD, 5-day, 20 deg. C | 8 | 11 | 0 | ||
| Cadmium, total recoverable | 0 | 11 | 0 | ||
| Flow, in conduit or thru treatment plant | 6 | 10 | 0 | ||
| Silver total recoverable | 0 | 10 | 0 | ||
| Lead, potentially dissolvd | 0 | 9 | 0 | ||
| Solids, total suspended | 6 | 8 | 0 | ||
| Copper, total recoverable | 0 | 8 | 0 | ||
| Temperature, water deg. centigrade | 4 | 7 | 0 | ||
| Nonylphenol | 4 | 6 | 0 | ||
| Manganese, potentially dissolvd | 0 | 6 | 0 | ||
| Coliform, fecal general | 0 | 6 | 0 | ||
| E. coli | 4 | 5 | 0 | ||
| Mercury, total [as Hg] | 5 | 4 | 0 | ||
| Chloride [as Cl] | 4 | 4 | 0 | ||
| Oil and grease | 2 | 4 | 0 | ||
| BOD, 5-day, percent removal | 2 | 4 | 0 | ||
| Solids, suspended percent removal | 2 | 4 | 0 | ||
| Oil and grease visual | 2 | 4 | 0 | ||
| Cyanide, weak acid, dissociable | 0 | 4 | 0 | ||
| Chromium, hexavalent dissolved [as Cr] | 0 | 4 | 0 | ||
| Selenium, potentially dissolvd | 0 | 4 | 0 | ||
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | 3 | 3 | 0 | ||
| Static Renewal 7 Day Chronic Pimephales promelas | 3 | 3 | 0 | ||
| Nickel, potentially dissolvd | 0 | 3 | 0 | ||
| Nitrogen, inorganic total | 4 | 2 | 0 | ||
| Iron, dissolved [as Fe] | 4 | 2 | 0 | ||
| Sulfate | 4 | 2 | 0 | ||
| Plant capacity fact. percent of capacity | 2 | 2 | 0 | ||
| Arsenic, total recoverable | 2 | 2 | 0 | ||
| LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia | 1 | 2 | 0 | ||
| LC50 Static Renewal 96Hr Acute Pimephales promelas | 1 | 2 | 0 | ||
| Iron, total recoverable | 0 | 2 | 0 | ||
| Nickel, total recoverable | 0 | 2 | 0 | ||
| Molybdenum, total recoverable | 0 | 2 | 0 | ||
| Chromium, trivalent, potentially dissolvd | 0 | 2 | 0 | ||
| Chromium, trivalent total recoverable | 0 | 2 | 0 | ||
| Mercury, total low level | 0 | 2 | 0 | ||
| Toxicity [chronic], Ceriodaphnia dubia | 0 | 2 | 0 | ||
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | 0 | 2 | 0 | ||
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | 0 | 2 | 0 | ||
| %Effect Static Renewal 7Day Chronic Pimephales promelas | 0 | 2 | 0 | ||
| Manganese, dissolved [as Mn] | 4 | 0 | 0 | ||
| Sulfide-hydrogen sulfide [undissociated] | 4 | 0 | 0 | ||
| Nitrogen, nitrite total [as N] | 3 | 0 | 0 | ||
| Nitrogen, nitrate total [as N] | 3 | 0 | 0 | ||
| Cyanide, total [as CN] | 1 | 0 | 0 | ||
| Arsenic, total [as As] | 1 | 0 | 0 | ||
| Cadmium, total [as Cd] | 1 | 0 | 0 | ||
| Chromium, total [as Cr] | 1 | 0 | 0 | ||
| Copper, total [as Cu] | 1 | 0 | 0 | ||
| Lead, total [as Pb] | 1 | 0 | 0 |
NPDES CO0031844: inspections, violations and enforcement
NPDES CO0031844: 1 single-event violation
| Date | What EPA recorded | Agency |
|---|---|---|
| February 23, 2022 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
NPDES CO0031844: 1 inspection
| Date | What EPA recorded | Agency |
|---|---|---|
| January 30, 2026 | Evaluation | S |
NPDES CO0031844 (UTSD WWTF): no formal enforcement action and informal enforcement action on file.
Watch NPDES CO0031844
NPDES CO0031844: one email when its EPA record changes — $99/month.
Permits near NPDES CO0031844
NPDES CO0031844: 65 pollutant rows, 2 dated events; ICIS-NPDES download, loaded September 15, 2026.