Clean Water Act discharge permit · NPDES CA0105295

RIALTO MUNICIPAL WWTP, Rialto, CA: NPDES CA0105295 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MajorDischarger class
158Pollutants under a numeric limit
15Pollutants with an effluent exceedance

RIALTO MUNICIPAL WWTP, held by RIALTO, CITY OF, holds NPDES permit CA0105295, which discharges to Santa Ana River. EPA’s file records it issued March 2, 2007 and expiring March 2, 2012. 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	RIALTO MUNICIPAL WWTP
Permittee as filed	RIALTO, CITY OF
NPDES ID	CA0105295
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	March 2, 2007
Expiration date	March 2, 2012
Address	Rialto, CA 92316
Receiving water	SANTA ANA RIVER
Receiving water impaired	303(D) Listed
Subwatershed	East Etiwanda Creek-Santa Ana River (HUC 180702030804)
Program components on file	POTW, Pretreatment
SIC	4952 – Sewerage Systems
Other EPA IDs (FRS)	RCRA handler CAL000067171

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

162Pollutants on file
158Under a numeric limit
162With a violation of any kind
15With 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 162 are shown.

Pollutant or measure	Limits	Violations, any kind	Effluent exceedances	Latest exceedance	Largest exceedance, as filed
Cyanide, free available	0	58	16	February 28, 2026	233% over the limit
Coliform, total general	4	77	14	January 31, 2024	99,999% over the limit
Solids, total dissolved	13	84	13	December 31, 2017	91% over the limit
Chlorine, total residual	2	49	12	January 31, 2009	99,999% over the limit
pH	6	72	11	December 31, 2009
Turbidity	4	61	11	February 28, 2005
Selenium, total recoverable	3	17	8	October 31, 2005	170% over the limit
Di[2-ethylhexyl] phthalate [DEHP]	9	49	6	September 30, 2011	188% over the limit
Solids, total suspended	6	106	2	March 31, 2023	765% over the limit
Nickel, total recoverable	3	25	2	November 30, 2004	38% over the limit
BOD, 5-day, percent removal	2	23	2	March 31, 2023	99,999% over the limit
Cyanide, total [as CN]	9	12	2	May 31, 2012	71% over the limit
.gamma.-BHC	3	9	2	May 31, 2006	75% over the limit
Nitrogen, ammonia total [as N]	3	30	1	September 30, 2023	99,999% over the limit
Lead, total recoverable	3	16	1	September 30, 2014	30% over the limit
BOD, 5-day, 20 deg. C	6	104	0
Flow, in conduit or thru treatment plant	6	59	0
Specific conductance	6	58	0
TU Static Renewal 7-Day Chronic Ceriodaphnia dubia	4	41	0
Fluoride, total [as F]	3	35	0
Nitrogen, inorganic total	4	29	0
Boron, total [as B]	0	27	0
Iron, total recoverable	0	24	0
Manganese, total recoverable	0	24	0
Hardness, total [as CaCO3]	3	23	0
Copper, total recoverable	5	21	0
Solids, suspended percent removal	2	21	0
Nitrogen, nitrate total [as N]	2	19	0
Mercury, total recoverable	9	13	0
Thallium, total recoverable	3	11	0
2-Methyl-4,6-dinitrophenol	3	11	0
1,2-Dichloroethane	3	11	0
Bromoform	3	11	0
Toluene	3	11	0
.delta.-BHC	3	11	0
Acenaphthylene	3	11	0
Acenaphthene	3	11	0
Acrolein	3	11	0
Anthracene	3	11	0
Bis[2-chloroethoxy]methane	3	11	0
Bis[2-chloroisopropyl] ether	3	11	0
Butyl benzyl phthalate	3	11	0
Chlorobenzene	3	11	0
Diethyl phthalate	3	11	0
Dimethyl phthalate	3	11	0
Endosulfan sulfate	3	11	0
.beta.-Endosulfan	3	11	0
.alpha.-Endosulfan	3	11	0
Endrin aldehyde	3	11	0
Ethylbenzene	3	11	0
Fluoranthene	3	11	0
Fluorene	3	11	0
Hexachlorocyclopentadiene	3	11	0
Hexachlorobutadiene	3	11	0
Isophorone	3	11	0
Methyl bromide [Bromomethane]	3	11	0
Methyl chloride [Chloromethane]	3	11	0
Methylene chloride	3	11	0
N-Nitrosodiphenylamine	3	11	0
Nitrobenzene	3	11	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 CA0105295.

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.

Watch this permit

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How we handle your data → Privacy

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 CA0105295 there.

Nearby on the register

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

This public-records page covers the Clean Water Act discharge permit NPDES CA0105295 held by RIALTO, CITY OF for the RIALTO MUNICIPAL WWTP in Rialto, CA, which discharges to the SANTA ANA RIVER, a 303(D) listed water. The permit is administratively continued, classed as a Major Discharger, and lists 15 pollutants under a numeric limit, with 158 pollutants having an effluent exceedance.