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Clean Water Act discharge permit · NPDES CA8000326

MICHELSON WRP, Irvine, CA: NPDES CA8000326 discharge permit, effluent exceedances, inspections, penalties

MICHELSON WRP, held by Irvine Ranch Water District, holds NPDES permit CA8000326, which discharges to Rattlesnake, Siphon, Sand Canyon Reservoirs. EPA’s file records it issued November 30, 2007 and expiring November 1, 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 filedMICHELSON WRP
Permittee as filedIrvine Ranch Water District
NPDES IDCA8000326
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeIndividual permit
Discharger classMajor discharger
Facility typePublicly owned treatment works
ProgramPublicly owned treatment works
IssuedNovember 30, 2007
Expiration dateNovember 1, 2012
AddressIrvine, CA 92612
Receiving waterRattlesnake, Siphon, Sand Canyon Reservoirs
Receiving water impaired303(D) Listed
SubwatershedPeters Canyon Wash (HUC 180702040101)
Program components on filePOTW, Pretreatment, Storm Water Industrial
SIC4952 – Sewerage Systems
Other EPA IDs (FRS)RCRA handler CAD981694672; ICIS-AIR source CASCA00006059CB127

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

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 165 are shown.

Pollutant or measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
pH88163May 31, 2015
Chlorine, total residual32819October 31, 20131,300% over the limit
Solids, total dissolved42719August 31, 20247% over the limit
Copper, total recoverable111911July 31, 2014281% over the limit
Solids, total suspended8346March 31, 2015390% over the limit
Turbidity10175July 31, 2006
Coliform, total general0123August 31, 20251,527% over the limit
Nitrogen, ammonia total [as N]4102July 31, 201253% over the limit
Coliform, fecal general622May 31, 2012255% over the limit
BOD, 5-day, 20 deg. C8251June 30, 201499,999% over the limit
Sodium, total recoverable3121April 30, 2005
Fluoride, total [as F]361August 31, 2007542% over the limit
Hardness, total [as CaCO3]4180
Flow, in conduit or thru treatment plant8130
Specific conductance8120
Dichlorobromomethane4110
Chloride [as Cl]3110
Chemical Oxygen Demand [COD]5100
Chromium, hexavalent [as Cr]490
Mercury, total recoverable1180
Silver total recoverable480
Cadmium, total recoverable480
Lead, total recoverable480
Chromium, total recoverable480
Nitrogen, total [as N]380
TU Static Renewal 7-Day Chronic Ceriodaphnia dubia380
Cyanide, free available080
Turbidity, time above limit080
Antimony, total recoverable470
Di[2-ethylhexyl] phthalate [DEHP]470
Arsenic, total recoverable460
Selenium, total recoverable460
Beryllium, total recoverable [as Be]460
Carbonate ion- [as CO3]360
Nitrogen, inorganic total450
Thallium, total recoverable450
Chromium, trivalent [as Cr]450
Nickel, total recoverable450
Zinc, total recoverable450
2-Methyl-4,6-dinitrophenol450
Carbon tetrachloride450
1,2-Dichloroethane450
Bromoform450
Dibromochloromethane450
Chloroform450
Toluene450
Benzene450
.delta.-BHC450
Acenaphthylene450
Acenaphthene450
Acrolein450
Acrylonitrile450
Anthracene450
Benzo[b]fluoranthene450
Benzo[k]fluoranthene450
Benzo[a]pyrene450
Bis[2-chloroethyl] ether450
Bis[2-chloroethoxy]methane450
Bis[2-chloroisopropyl] ether450
Butyl benzyl phthalate450

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

EPA’s single-event violation file, as loaded, holds no violation for NPDES CA8000326.

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 CA8000326 there.

Nearby on the register

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

What this page shows

This public-records page covers NPDES permit CA8000326 for the MICHELSON WRP in Irvine, CA, held by Irvine Ranch Water District, with its permit status listed as administratively continued. The figures listed are 159 for the discharger class, 12 pollutants under a numeric limit, and 12 pollutants with an effluent exceedance.