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Clean Water Act discharge permit · NPDES CA0023060

WILLITS WWTF, Willits, CA: NPDES CA0023060 discharge permit, effluent exceedances, inspections, penalties

WILLITS WWTF, held by Willits, City of, holds NPDES permit CA0023060, which discharges to Eel R/Baechtel Cr, Outlet Creek. EPA’s file records it issued June 10, 2010 and expiring July 31, 2015. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filedWILLITS WWTF
Permittee as filedWillits, City of
NPDES IDCA0023060
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
IssuedJune 10, 2010
Expiration dateJuly 31, 2015
AddressWillits, CA 95490
Receiving waterEEL R/BAECHTEL CR, Outlet Creek
Receiving water impaired303(D) Listed
SubwatershedBaechtel Creek (HUC 180101030401)

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

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 186 are shown.

Pollutant or measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
Solids, total suspended75610April 30, 20241,130% over the limit
Coliform, total general2259April 30, 2025283% over the limit
pH6367May 31, 2019
BOD, 5-day, 20 deg. C7454December 31, 201234% over the limit
Nitrogen, total [as N]3404March 31, 2024306% over the limit
Copper, total recoverable21992February 29, 2016506% over the limit
Di[2-ethylhexyl] phthalate [DEHP]2302February 29, 2016456% over the limit
Solids, settleable4202May 31, 2019400% over the limit
BOD, 5-day, percent removal182March 31, 202699,999% over the limit
Cyanide, total [as CN]4151May 31, 201279% over the limit
Chlorine, total residual2131November 30, 201014,900% over the limit
Solids, suspended percent removal171August 31, 2012145% over the limit
Cerium, total1370
Lithium, total [as Li]1360
Silica, total [as SiO2]1340
Flow, in conduit or thru treatment plant4320
Arsenic, total recoverable2320
Thallium, total recoverable2320
Beryllium, total recoverable [as Be]2320
Cadmium, total recoverable2320
Antimony, total recoverable2320
Molybdenum, total recoverable1320
Selenium, total recoverable2310
Silver total recoverable2310
Mercury, total recoverable2310
Nitrogen, ammonia total [as N]2300
Lead, total recoverable2300
Cobalt, total recoverable1300
Tin, total recoverable1300
Titanium, total recoverable1300
Boron, total recoverable1300
Manganese, total recoverable1300
Nickel, total recoverable2290
Zinc, total recoverable2290
Phosphorous, total recoverable1290
Calcium, total recoverable1290
Magnesium, total recoverable1290
Sodium, total recoverable1290
Potassium, total recoverable1290
Iron, total recoverable1290
Barium, total recoverable1290
Strontium, total recoverable, ug/L1290
Aluminum, total recoverable1290
Chromium, total recoverable1290
Vanadium, total recoverable1290
Oil and grease1290
Chemical Oxygen Demand [COD]1290
Nitrogen, nitrite total [as N]2280
Nitrogen, organic total [as N]2250
%Surv Static Renewal 96Hr Oncorhynchus mykiss4160
Nitrogen, nitrate total [as N]2160
Dichlorobromomethane4140
96Hr Acute Ceriodaphn. Dubia % Srv4120
TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)4110
TU Static Renewal 7-Day Chronic Ceriodaphnia dubia4110
TU Static Renewal 7-Day Chronic Pimphales promelas4110
Phosphorus, total [as P]2100
2-Chloroethyl vinyl ether, [mixed]270
.delta.-BHC260
Endosulfan sulfate260

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 CA0023060.

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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Nearby on the register

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

What this page shows

This public-records page covers NPDES permit CA0023060 for the WILLITS WWTF in Willits, CA, held by Willits, City of, with an administratively continued status and a Major Discharger class. The page lists 186 pollutants on file, 174 under a numeric limit, 12 with an effluent exceedance, and 176 with a violation.