Clean Water Act discharge permit · NPDES CA0079103

MODESTO WQCF, Modesto, CA: NPDES CA0079103 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MajorDischarger class
211Pollutants under a numeric limit
11Pollutants with an effluent exceedance

MODESTO WQCF, held by Modesto, City of, holds NPDES permit CA0079103, which discharges to San Joaquin River. EPA’s file records it issued June 7, 2012 and expiring June 1, 2017. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filed	MODESTO WQCF
Permittee as filed	Modesto, City of
NPDES ID	CA0079103
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	June 7, 2012
Expiration date	June 1, 2017
Address	Modesto, CA 95351
Receiving water	San Joaquin River
Subwatershed	Lake Ramona-San Joaquin River (HUC 180400020403)
Program components on file	POTW, Pretreatment
SIC	4952 – Sewerage Systems
Other EPA IDs (FRS)	RCRA handler CAD982028169

Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download; cross-program IDs from EPA’s FRS facility-registry crosswalk.

Effluent limits and exceedances

235Pollutants on file
211Under a numeric limit
234With a violation of any kind
11With 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 235 are shown.

Pollutant or measure	Limits	Violations, any kind	Effluent exceedances	Latest exceedance	Largest exceedance, as filed
Coliform, total general	3	28	15	August 31, 2017	7,813% over the limit
Molybdenum, total [as Mo]	0	21	6	March 31, 2008	9,000% over the limit
Chloride [as Cl]	2	8	4	February 29, 2012	13% over the limit
% Survival Static Renewal 96Hr Acute Pimephales promelas	0	15	3	April 30, 2009	39% over the limit
Solids, suspended percent removal	2	12	3	March 31, 2016	20% over the limit
pH	6	33	2	February 29, 2016
Specific conductance	14	29	2	February 29, 2016	1% over the limit
Copper, total [as Cu]	0	23	2	March 31, 2008	8% over the limit
Chlorine, total residual	2	32	1	May 31, 2002	16,400% over the limit
BOD, 5-day, percent removal	2	10	1	March 31, 2016	80% over the limit
Nitrite + Nitrate total [as N]	2	1	1	August 31, 2017	45% over the limit
BOD, 5-day, 20 deg. C	22	138	0
Solids, total suspended	22	133	0
Nitrogen, ammonia total [as N]	32	67	0
Selenium, total recoverable	2	58	0
Bromoform	2	52	0
Chloroform	2	52	0
Cyanide, total [as CN]	2	50	0
Arsenic, total recoverable	2	50	0
Thallium, total recoverable	2	50	0
Beryllium, total recoverable [as Be]	2	50	0
Chromium, hexavalent [as Cr]	2	50	0
Nickel, total recoverable	2	50	0
Silver total recoverable	2	50	0
Zinc, total recoverable	2	50	0
Cadmium, total recoverable	2	50	0
Lead, total recoverable	2	50	0
Antimony, total recoverable	2	50	0
2-Methyl-4,6-dinitrophenol	2	50	0
1,2-Dichloroethane	2	50	0
Toluene	2	50	0
Benzene	2	50	0
.delta.-BHC	2	50	0
Acenaphthylene	2	50	0
Acenaphthene	2	50	0
Acrolein	2	50	0
Acrylonitrile	2	50	0
Anthracene	2	50	0
Benzo[b]fluoranthene	2	50	0
Benzo[k]fluoranthene	2	50	0
Benzo[a]pyrene	2	50	0
Bis[2-chloroethyl] ether	2	50	0
Bis[2-chloroethoxy]methane	2	50	0
Bis[2-chloroisopropyl] ether	2	50	0
Butyl benzyl phthalate	2	50	0
Chlorobenzene	2	50	0
Chrysene	2	50	0
Diethyl phthalate	2	50	0
Dimethyl phthalate	2	50	0
1,2-Diphenylhydrazine	2	50	0
Endosulfan sulfate	2	50	0
.beta.-Endosulfan	2	50	0
.alpha.-Endosulfan	2	50	0
Endrin aldehyde	2	50	0
Ethylbenzene	2	50	0
Fluoranthene	2	50	0
Fluorene	2	50	0
Hexachlorocyclopentadiene	2	50	0
Hexachlorobutadiene	2	50	0
Hexachloroethane	2	50	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 CA0079103.

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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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 CA0079103 there.

Nearby on the register

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