Clean Water Act discharge permit · NPDES NN0020621

SHIPROCK WWTF, Shiprock, NM: NPDES NN0020621 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MajorDischarger class
139Pollutants under a numeric limit
9Pollutants with an effluent exceedance

SHIPROCK WWTF, held by NAVAJO TRIBAL UTILITY AUTHORITY, holds NPDES permit NN0020621, which discharges to San Juan River. EPA’s file records it issued February 21, 2018 and expiring February 28, 2023. 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	SHIPROCK WWTF
Permittee as filed	NAVAJO TRIBAL UTILITY AUTHORITY
NPDES ID	NN0020621
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	February 21, 2018
Expiration date	February 28, 2023
Address	Shiprock, NM 87420
Receiving water	SAN JUAN RIVER
Subwatershed	Rattlesnake Wash-San Juan River (HUC 140801050704)

Cited to the EPA ICIS-NPDES permit file (ECHO download).

Effluent limits and exceedances

148Pollutants on file
139Under a numeric limit
147With a violation of any kind
9With 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; the 60 with the most exceedances of 148 are shown.

Pollutant or measure	Limits	Violations, any kind	Effluent exceedances	Latest exceedance	Largest exceedance, as filed
E. coli	4	132	121	August 31, 2025	99,999% over the limit
BOD, 5-day, 20 deg. C	14	108	64	August 31, 2010	439% over the limit
Coliform, fecal general	0	59	57	June 30, 2007	299,900% over the limit
Solids, total suspended	14	70	31	March 31, 2010	140% over the limit
pH	4	32	18	November 30, 2013
BOD, 5-day, percent removal	2	23	16	August 31, 2010	247% over the limit
Chlorine, total residual	2	17	10	September 30, 2015	21,900% over the limit
Solids, suspended percent removal	2	13	6	March 31, 2010	226% over the limit
Nitrogen, ammonia total [as N]	6	7	1	February 28, 2019	8% over the limit
Nitrogen, ammonia [NH3-N]	0	39	0
Salinity	0	35	0
Nitrogen, ammonia, total [as NH3]	0	26	0
Solids, total dissolved	6	20	0
Flow, in conduit or thru treatment plant	8	16	0
TU Static Renewal 7-Day Chronic Pimphales promelas	0	16	0
Pass/Fail Static Renewal 7Day Chronic Pimephales promelas	4	12	0
Temperature, water deg. fahrenheit	0	12	0
Chronic Mthd Sublethal Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, StatR7d P promelas	0	9	0
Cyanide, total [as CN]	1	2	0
Arsenic, total recoverable	1	2	0
Selenium, total recoverable	1	2	0
Thallium, total recoverable	1	2	0
Beryllium, total recoverable [as Be]	1	2	0
Nickel, total recoverable	1	2	0
Silver total recoverable	1	2	0
Zinc, total recoverable	1	2	0
Cadmium, total recoverable	1	2	0
Lead, total recoverable	1	2	0
Copper, total recoverable	1	2	0
Antimony, total recoverable	1	2	0
2-Methyl-4,6-dinitrophenol	1	2	0
Dichlorobromomethane	1	2	0
Carbon tetrachloride	1	2	0
1,2-Dichloroethane	1	2	0
Bromoform	1	2	0
Dibromochloromethane	1	2	0
Chloroform	1	2	0
Toluene	1	2	0
Benzene	1	2	0
.delta.-BHC	1	2	0
Acenaphthylene	1	2	0
Acenaphthene	1	2	0
Acrolein	1	2	0
Acrylonitrile	1	2	0
Anthracene	1	2	0
Benzo[b]fluoranthene	1	2	0
Benzo[k]fluoranthene	1	2	0
Benzo[a]pyrene	1	2	0
Bis[2-chloroethyl] ether	1	2	0
Bis[2-chloroethoxy]methane	1	2	0
Bis[2-chloroisopropyl] ether	1	2	0
Butyl benzyl phthalate	1	2	0
Chlorobenzene	1	2	0
Chrysene	1	2	0
Diethyl phthalate	1	2	0
Dimethyl phthalate	1	2	0
1,2-Diphenylhydrazine	1	2	0
Endosulfan sulfate	1	2	0
.beta.-Endosulfan	1	2	0
.alpha.-Endosulfan	1	2	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

3Single-event violations

Date	What EPA recorded	Agency
November 3, 2025	Dry-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangerment	EP6
June 1, 2025	Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment	EP6
June 5, 2024	Failure to submit report to the permitting authority of any anticipated bypass [122.41(m)(3)(i)]	EP6

Velarion’s copy of EPA’s ICIS-NPDES files does not yet 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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Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.