World wastewater treatment plant observatory · data as reported by each inventory

Wastewater treatment plants in United States · California

486 inventory records · HydroWASTE v1.0 / United States

Data years: 2012. The inventory date does not establish current operation.

486 results

Name	Native size	Year
BYRON SAN DIS WWTFHW:26115	900 population served	2012
BRIDGEPORT WWTFHW:26177	900 population served	2012
Covelo WWTPHW:25807	890 population served	2012
REDWAY WWTFHW:25795	888 population served	2012
DORRIS WWTFHW:25818	886 population served	2012
BOLINAS WWTFHW:25875	885 population served	2012
BIEBER WWTFHW:26161	874 population served	2012
BIG BASIN ST PK WWTFHW:25930	855 population served	2012
ISLETON WWTFHW:26011	828 population served	2012
FORESTVILLE WWTFHW:25786	827 population served	2012
MIRANDA WWTFHW:25793	825 population served	2012
TRANCAS WWTFHW:25938	820 population served	2012
Geyserville WWTFHW:25829	809 population served	2012
GRAYSON WWTFHW:26009	802 population served	2012
CUYAMA WWTFHW:25923	800 population served	2012
BIG PINE WWTFHW:26176	800 population served	2012
PAUMA VALLEY WWTFHW:26259	800 population served	2012
MANILA WWTFHW:25828	785 population served	2012
Etna Wastewater Treatment FacilityHW:25819	781 population served	2012
RIPLEY WWTFHW:26205	762 population served	2012
Oak Shores WWTFHW:25925	751 population served	2012
LOLETA WWTFHW:25821	750 population served	2012
Plumas Eureka WWTPHW:26123	750 population served	2012
Lake Shastina WWTFHW:25817	713 population served	2012
Boulder Creek WWTFHW:25906	700 population served	2012
KNIGHTS LANDING WWTFHW:26071	663 population served	2012
FORT JONES WWTFHW:25831	660 population served	2012
Santa Nella WWTFHW:26055	655 population served	2012
Sheridan WWTFHW:26088	600 population served	2012
LOST HILLS WWTFHW:26157	600 population served	2012
BAKER WWTFHW:26180	600 population served	2012
Pine Valley WWTFHW:26248	600 population served	2012
Stallion Springs CSD WWTFHW:26162	561 population served	2012
CALPELLA WWTPHW:25814	540 population served	2012
Julian Water Pollution Control FacHW:26242	528 population served	2012
OCEANA MARIN WWTFHW:25863	526 population served	2012
Pfeiffer Big Sur WWTFHW:25911	500 population served	2012
AVILA BEACH WWTFHW:25917	500 population served	2012
SAN ARDO WWTFHW:25927	500 population served	2012
MALIBU WWTFHW:25939	500 population served	2012
Reeder Tract WWTFHW:26160	500 population served	2012
Delleker WWTFHW:26122	425 population served	2012
Vallecito_Douglas Flat WWTFHW:26028	400 population served	2012
Robbins WWTFHW:26155	391 population served	2012
Snelling WWTFHW:26021	380 population served	2012
SONOMA CO AIRPORT WWTFHW:25802	370 population served	2012
HILTON CREEK WWTFHW:26171	357 population served	2012
MILLER KILPATRICK WWTFHW:25940	351 population served	2012
Port Costa WWTFHW:25837	350 population served	2012
TRES PINOS WWTFHW:25929	350 population served	2012
Yosemite West WWTFHW:26152	350 population served	2012
Skyline Ranch Country Club WWTFHW:26261	350 population served	2012
NEWELL WWTFHW:25826	336 population served	2012
Tomales WWTPHW:25864	325 population served	2012
LEMON COVE WWTFHW:26130	308 population served	2012
HOPLAND WWTFHW:25790	300 population served	2012
Sea Ranch WWTFHW:25827	300 population served	2012
ADIN WWTFHW:26110	300 population served	2012
RICHVALE WWTFHW:26139	300 population served	2012
CAMINO HGTS WWTF CSD 21HW:26153	300 population served	2012
NORTH SHORE WWRFHW:26189	290 population served	2012
Westport STFHW:25783	285 population served	2012
COULTERVILLE WWTFHW:25979	280 population served	2012
WARM SPRINGS REHAB WWTFHW:25937	264 population served	2012
MOCCASIN WWTFHW:26080	262 population served	2012
GORMAN WWTFHW:25936	251 population served	2012
DON PEDRO WWTFHW:26150	250 population served	2012
BECKWOURTH WWTFHW:26112	228 population served	2012
Geyla Mannor Wastewater PlantHW:26061	225 population served	2012
LOG CABIN RANCH WWTFHW:25884	220 population served	2012
BEAR CREEK ESTATES WWTFHW:25916	200 population served	2012
MUNTZ MENDENHALL WWTFHW:25941	199 population served	2012
PAIGE AFFLERBAUGH WWTFHW:25942	188 population served	2012
Redwood Park CSD WWTPHW:25820	160 population served	2012
Hopland Band WWTPHW:25791	140 population served	2012
MOTHER LODE WWTFHW:26030	133 population served	2012
Six Mile Village WWTFHW:26033	133 population served	2012
Angel Island State Park WWTFHW:25870	130 population served	2012
Puerta La Cruz Conserv Camp WWTFHW:26206	130 population served	2012
ANCHOR BAY WWTFHW:25813	100 population served	2012
Wilseyville STPHW:26032	90 population served	2012
APPLEGATE WWTFHW:26089	85 population served	2012
PARADISE COVE WWTFHW:25866	54 population served	2012
Mariposa Pines WWTFHW:26151	35 population served	2012
Blythe Airport WWTFHW:26207	30 population served	2012
Rio Ramaza WWTFHW:26156	20 population served	2012

Regulatory context

General reference. This is not an exhaustive review of applicable law.

United States: Clean Water Act / NPDES

NPDES regulates pollutant discharges from point sources to waters of the United States. The permit sets limits and monitoring conditions. A CWNS code identifies an inventory record, not an NPDES permit.

Permit identifier and permitting authority: EPA or an authorized state.
Outfall and receiving water; sewer connections follow a different control route.
Current permit conditions, limits and dated measurements; these are not included in CWNS.

US EPA · NPDES Permit Basics

References reviewed: 2026-11-06. Individual applicability: undetermined. This profile does not establish authorization or compliance.