Clean Water Act discharge permit · NPDES CO0040673

LAKE CITY WWTF, Lake City, CO: NPDES CO0040673 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
12Pollutants under a numeric limit
8Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

LAKE CITY WWTF, held by Lake City Town of, holds NPDES permit CO0040673, which discharges to Gunnison River. EPA’s file records it issued February 27, 2013 and expiring March 31, 2018.

LAKE CITY WWTF, Lake City, Colorado: Individual permit CO0040673, held by Lake City Town of; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued February 27, 2013, term to March 31, 2018; discharges to GUNNISON RIVER.

BOD, 5-day, 20 deg. C: 6 limits, 53 violations of any kind, 29 effluent exceedances, latest July 31, 2026, largest 500% over the limit.
Nitrogen, ammonia total [as N]: 24 limits, 18 violations of any kind, 10 effluent exceedances, latest March 31, 2026, largest 176% over the limit.
Solids, total suspended: 2 limits, 18 violations of any kind, 8 effluent exceedances, latest October 31, 2025, largest 182% over the limit.
E. coli: 2 limits, 14 violations of any kind, 7 effluent exceedances, latest July 31, 2026, largest 99,999% over the limit.
BOD, 5-day, percent removal: 1 limit, 7 violations of any kind, 6 effluent exceedances, latest August 31, 2018, largest 267% over the limit.
Coliform, fecal general: 0 limits, 7 violations of any kind, 5 effluent exceedances, latest July 31, 2012, largest 733% over the limit.
pH: 2 limits, 6 violations of any kind, 4 effluent exceedances, latest September 30, 2025.
Flow, in conduit or thru treatment plant: 4 limits, 11 violations of any kind, 1 effluent exceedance, latest September 30, 2007, largest 214% over the limit.
Nitrogen, inorganic total: 0 limits, 59 violations of any kind, 0 effluent exceedances.
Solids, total dissolved: 2 limits, 12 violations of any kind, 0 effluent exceedances.
Plant capacity fact. percent of capacity: 2 limits, 11 violations of any kind, 0 effluent exceedances.
Oil and grease: 1 limit, 2 violations of any kind, 0 effluent exceedances.
Chlorine, total residual: 1 limit, 1 violation of any kind, 0 effluent exceedances.
Oil and grease visual: 1 limit, 1 violation of any kind, 0 effluent exceedances.

September 18, 2026: Letter of Violation/ Warning Letter (State).
May 15, 2026: Letter of Violation/ Warning Letter (State).
April 17, 2026: Letter of Violation/ Warning Letter (State).
March 13, 2026: Letter of Violation/ Warning Letter (State).

Colorado holds 206 Publicly owned treatment works coverages of this permit type in EPA’s file; 169 were issued before CO0040673.

Coverages issued nearest CO0040673

November 28, 2012: MANCOS TOWN OF, Montezuma County, CO0021687, held by Mancos Town of
November 28, 2012: VISTA WWTF, Pagosa Springs, CO0031755, held by Pagosa Area Water and San Dist
November 28, 2012: UPPER VALLEY SANITATION DIST., La Plata County, CO0047147, held by Upper Valley San Dist
January 15, 2013: CRESTED BUTTE TOWN OF WWTF, Crested Butte, CO0020443, held by Crested Butte Town of
January 17, 2013: DURANGO CITY OF, Durango, CO0024082, held by Durango City of
March 28, 2013: DELTA WWTF, Delta County, CO0039641, held by Delta City of
April 30, 2013: GUNNISON CITY OF, Gunnison, CO0041530, held by Gunnison City of
April 30, 2013: TELLURIDE REGIONAL WWTF, San Miguel County, CO0041840, held by Telluride Town of
May 30, 2013: MT CRESTED BUTTE WATER AND SANITATION DIST, Mount Crested Butte, CO0027171, held by Mt Crested Butte WSD
May 30, 2013: WEST MONTROSE SANITATION DIST WWTF, Montrose, CO0030449, held by West Montrose Sanitation District

LAKE CITY WWTF among its neighbors

EPA’s permit file holds 9 discharge permits in the Larson Creek-Lake Fork subwatershed (HUC 140200020605), CO0040673 among them. Its county holds 12, 0 of them major permits; CO0040673 is a minor permit.

Other permits in the Larson Creek-Lake Fork subwatershed (HUC 140200020605)

GOLDEN WONDER MINE, Hinsdale County: CO0048119, minor permit, discharging to Deadman Gulch, permit term to January 31, 2015
L & N INC, Hinsdale County: COG588052, minor permit, discharging to LAKE FORK OF THE GUNNISON RIVER, permit term to May 31, 2010
L & N INC, Lake City: COG590052, minor permit, discharging to Lake Fork of Gunnison River, permit term to March 31, 2028
LAKE CITY WWTP, Lake City: COG081214, minor permit, discharging to Lake Fork, permit term to May 31, 2028
LAKE CITY WWTP, Lake City: COR427146, minor permit, permit term to March 31, 2029
LEGACY LODGE, Hinsdale County: COX622020, minor permit, discharging to Groundwater, permit term to May 31, 2012
VALLEY VIEW LEGACY RANCH, Lake City: COR426972, minor permit, permit term to March 31, 2029
VICKERS HORSE RIVER RANCH, Lake City: COG590132, minor permit, discharging to Lake Fork of Gunnison River, permit term to March 31, 2026

Identity

Facility as filed	LAKE CITY WWTF
Permittee as filed	Lake City Town of
NPDES ID	CO0040673
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Individual permit
Discharger class	Minor discharger
Facility type	Publicly owned treatment works
Program	Publicly owned treatment works
Issued	February 27, 2013
Expiration date	March 31, 2018
Address	Lake City, CO 81235
Receiving water	GUNNISON RIVER
Subwatershed	Larson Creek-Lake Fork (HUC 140200020605)

Effluent limits and exceedances

14Pollutants on file
12Under a numeric limit
14With a violation of any kind
8With 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
BOD, 5-day, 20 deg. C	6	53	29	July 31, 2026	500% over the limit
Nitrogen, ammonia total [as N]	24	18	10	March 31, 2026	176% over the limit
Solids, total suspended	2	18	8	October 31, 2025	182% over the limit
E. coli	2	14	7	July 31, 2026	99,999% over the limit
BOD, 5-day, percent removal	1	7	6	August 31, 2018	267% over the limit
Coliform, fecal general	0	7	5	July 31, 2012	733% over the limit
pH	2	6	4	September 30, 2025
Flow, in conduit or thru treatment plant	4	11	1	September 30, 2007	214% over the limit
Nitrogen, inorganic total	0	59	0
Solids, total dissolved	2	12	0
Plant capacity fact. percent of capacity	2	11	0
Oil and grease	1	2	0
Chlorine, total residual	1	1	0
Oil and grease visual	1	1	0

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES CO0040673.

Inspections

EPA’s inspection file holds no inspection for NPDES CO0040673.

Formal enforcement and penalties

0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.

Informal enforcement

Date	What EPA recorded	Agency
September 18, 2026	Letter of Violation/ Warning Letter	State
May 15, 2026	Letter of Violation/ Warning Letter	State
April 17, 2026	Letter of Violation/ Warning Letter	State
March 13, 2026	Letter of Violation/ Warning Letter	State

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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.

This public-records page covers NPDES permit CO0040673 for the LAKE CITY WWTF in Lake City, CO, held by Lake City Town of and discharging to the GUNNISON RIVER, with a status of administratively continued. The page lists 14 pollutants on file, 12 of them under a numeric limit, and 8 with an effluent exceedance.