City of Westminster (CA) Water Quality

City of Westminster is a large public water system in EPA region 9 that provides tap water for the 92655 zip codes. It has 31 facilities where the water supply was tested for 78 chemical contaminants that impact tap water quality and human health.

The maximum reported level of HAA5 (five regulated haloacetic acids) was 6.1 µg/L. The maximum reported level of Manganese was 24.436 µg/L. There were 2 contamintants found in the City of Westminster water supply at levels that were above the minimum reporting level.

Contaminants

1,1-dichloroethane (24)

1,2,3-trichloropropane (24)

1,3-butadiene (24)

1,4-dioxane (24)

1-butanol (24)

11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (22)

1H,1H,2H,2H-perfluorodecane sulfonic acid (22)

1H,1H,2H,2H-perfluorohexane sulfonic acid (22)

1H,1H,2H,2H-perfluorooctane sulfonic acid (22)

2,4-dinitrotoluene (29)

2,6-dinitrotoluene (29)

2-methoxyethanol (24)

2-propen-1-ol (Allyl Alcohol) (24)

4,4'-dichloro dichlorophenyl ethylene (DDE) (29)

4,8-dioxa-3H-perfluorononanoic acid (22)

9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (22)

alpha-hexachlorocyclohexane (24)

anatoxin-a (8)

bromochloromethane (Halon 1011) (24)

bromomethane (24)

Butylated Hydroxyanisole (24)

chlorate (30)

chlorodifluoromethane (HCFC-22) (24)

chloromethane (24)

chlorpyrifos (24)

chromium (30)

chromium-6 (30)

cobalt (30)

cylindrospermopsin (8)

dimethipin (24)

dimethyl tetrachloroterephthalate (DCPA) mono/di-acid degradate (32)

ethoprop (24)

Germanium (24)

HAA5 (five regulated haloacetic acids) (32)

HAA6Br (six brominated haloacetic acids) (32)

HAA9 (nine haloacetic acids) (32)

hexafluoropropylene oxide dimer acid (GenX) (22)

lithium (22)

Manganese (24)

methyl-tertiary-butyl-ether (MTBE) (28)

molinate (29)

molybdenum (30)

N-ethyl perfluorooctanesulfonamidoacetic acid (22)

N-methyl perfluorooctanesulfonamidoacetic acid (22)

nitrobenzene (28)

nonafluoro-3,6-dioxaheptanoic acid (22)

o-toluidine (24)

oxyfluorfen (24)

perchlorate (54)

perfluoro(2-ethoxyethane)sulfonic acid (22)

perfluoro-3-methoxypropanoic acid (22)

perfluoro-4-methoxybutanoic acid (22)

perfluorobutanesulfonic acid (46)

perfluorobutanoic acid (22)

perfluorodecanoic acid (22)

perfluorododecanoic acid (22)

perfluoroheptanesulfonic acid (22)

perfluoroheptanoic acid (46)

perfluorohexanesulfonic acid (46)

perfluorohexanoic acid (22)

perfluorononanoic acid (46)

perfluorooctanesulfonic acid (46)

perfluorooctanoic acid (46)

perfluoropentanesulfonic acid (22)

perfluoropentanoic acid (22)

perfluorotetradecanoic acid (22)

perfluorotridecanoic acid (22)

perfluoroundecanoic acid (22)

profenofos (24)

quinoline (24)

s-ethyl-dipropylthiocarbamate (EPTC) (29)

strontium (30)

tebuconazole (24)

terbacil (29)

total microcystins (8)

Total Permethrin (24)

tribufos (24)

vanadium (30)

Sampling Facilities

Well 3
Ground Water (GW)

EP #35 - DL-WM-JODY-01Entry Point to the Distribution System (EP)

Reservoir Well 1
Ground Water (GW)

EP #29 - DL-WM-MONROE-01Entry Point to the Distribution System (EP)

Reservoir Well 2
Ground Water (GW)

EP #28 - DL-WM-HEFLEY-01Entry Point to the Distribution System (EP)

Well 4
Ground Water (GW)

EP #27 - DL-WM-SWALLOW-01Entry Point to the Distribution System (EP)

Well SC-4
Ground Water (GW)

EP #21 - DL-WM-KIOWA-01Entry Point to the Distribution System (EP)

Well 125
Ground Water (GW)

EP #19 - DL-WM-UNIVERSITY-01Entry Point to the Distribution System (EP)

Well 11
Ground Water (GW)

EP #37 - DL-WM-HAZARD-01Entry Point to the Distribution System (EP)

Well 107A
Ground Water (GW)

EP #39 - DL-WM-PURDY-01Entry Point to the Distribution System (EP)

MWD Intertie 1
Surface Water (SW)

IS-DIEMER-PLANTEFF-WESTEntry Point to the Distribution System (EP)

Well 75A
Ground Water (GW)

EP #41 - DL-WM-GOLDENWEST-01Entry Point to the Distribution System (EP)

Well 6
Ground Water (GW)

EP #26 - DL-WM-VONCIRCLE-01Entry Point to the Distribution System (EP)

Westminster Distribution System
Multiple Sources (MX)

DL-WM-HAZARD-01Distribution System (DS)
DL-WM-OASIS-01Distribution System (DS)
DL-WM-MONROE-01Distribution System (DS)
DL-WM-CONNER-01Distribution System (DS)
DL-WM-BENTON-01Distribution System (DS)
DL-WM-WESTPARK-01Distribution System (DS)
DL-WM-SUFFOLK-01Distribution System (DS)
DL-WM-GINGER-01Distribution System (DS)

Distribution System - DSMRT Site-SW
Surface Water (SW)

DL-WM-JASMINE-01Maximum Residence Time (MR)

Distribution System- DSMRT Site- GW
Ground Water (GW)

DL-WM-SUFFOLK-01Maximum Residence Time (MR)

EP- #036 WELL 001 - TRT CL XCLD
Ground Water (GW)

DL-WM-EDEN-01Entry Point to the Distribution System (EP)

MWD-OC35
Surface Water (SW)

IS-DIEMER-PLANTEFF-01Entry Point to the Distribution System (EP)

MWD-OC53
Surface Water (SW)

IS-DIEMER-PLANTEFF-01Entry Point to the Distribution System (EP)

RESERVOIR WELL 01
Ground Water (GW)

RESERVOIR WELL 01 05S/11W-01M02SR (SR)

RESERVOIR WELL 02
Ground Water (GW)

RESERVOIR WELL 02 05S/11W-03N05SR (SR)

WELL 001
Ground Water (GW)

WELL 001 05S/11W-13A02SR (SR)

WELL 003
Ground Water (GW)

WELL 003 05S/11W-24F03SR (SR)

WELL 004
Ground Water (GW)

WELL 004 05S/10W-18G01SR (SR)

WELL 006
Ground Water (GW)

WELL 006 05S/10W-07L01SR (SR)

WELL 022
Ground Water (GW)

WELL 022 05S/10W-07D04SR (SR)

WELL 075
Ground Water (GW)

WELL 075 05S/11W-03H04SR (SR)

WELL 099
Ground Water (GW)

WELL 099 05S/11W-10J04SR (SR)

WELL 107
Ground Water (GW)

WELL 107 05S/11W-12K01SR (SR)

WELL SC-04
Ground Water (GW)

WELL SC-04 05S/11W-03C01SR (SR)

WELL 089A
Ground Water (GW)

WELL 089A 05S/11W-02B03SR (SR)

WELL 125
Ground Water (GW)

WELL 125 05S/11W-04L01SR (SR)

WELL 11
Ground Water (GW)

WELL 11 3010064-030 (WM-11/1)SR (SR)

FAQ

Is City of Westminster tap water safe to drink?

When was City of Westminster last tested for water contamination?

The latest water samples were taken on March 18th, 2025.