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Tap water quality report

Gswc-South Arcadia

EPA monitoring tested this supplier for 81 contaminants and detected 19. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

81
contaminants tested
19
detected
27,072
people served
0
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Ground water
Ownership
Private
Counties served
Los Angeles

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

0
health-based violations
2
violations on file
0
still open
ViolationTypeStatusPeriod
Other Monitoring Resolved 2000-06-20 → 2000-10-19
Other Monitoring Resolved 2000-06-20 → 2000-10-19

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
PFHXS 0.0070 µg/L 6/10 2024
PFOS 0.0220 µg/L 6/10 2024
PFOA 0.0055 µg/L 4/10 2024

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Trichloroethylene
14 µg/L 280%
of the EPA limit, at the 95th percentile of samples — 5 µg/L
worst single sample: 20 µg/L
562/1681 SYR4 2012–2019
Nitrate
4885.7 µg/L 49%
of the EPA limit 10000 µg/L
worst single sample: 6328 µg/L
550/550 SYR4 2012–2019
Tetrachloroethylene
6.04 µg/L 121%
of the EPA limit, at the 95th percentile of samples — 5 µg/L
worst single sample: 7.8 µg/L
353/1634 SYR4 2012–2019
TTHM
7.38 µg/L 9.2%
of the EPA limit 80 µg/L
worst single sample: 9.6 µg/L
82/124 SYR4 2012–2019
Dibromochloromethane
2.75 µg/L
No EPA limit set
worst single sample: 3.2 µg/L
46/124 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 40/40 LCR 2023
Fluoride
853 µg/L 21%
of the EPA limit 4000 µg/L
worst single sample: 910 µg/L
39/39 SYR4 2012–2019
Bromoform
2.8 µg/L
No EPA limit set
worst single sample: 3.3 µg/L
30/124 SYR4 2012–2019
Bromodichloromethane
2.17 µg/L
No EPA limit set
worst single sample: 2.3 µg/L
27/124 SYR4 2012–2019
Chloroform
1.66 µg/L
No EPA limit set
worst single sample: 1.8 µg/L
15/124 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
3.05 µg/L 5.1%
of the EPA limit 60 µg/L
worst single sample: 3.5 µg/L
11/124 SYR4 2012–2019
Dibromoacetic Acid
1.255 µg/L
No EPA limit set
worst single sample: 1.3 µg/L
10/124 SYR4 2012–2019
Combined Uranium
4.3061 µg/L 14%
of the EPA limit 30 µg/L
worst single sample: 4.619 µg/L
8/8 SYR4 2012–2018
Nitrate-Nitrite
4610 µg/L 46%
of the EPA limit 10000 µg/L
worst single sample: 5600 µg/L
7/7 SYR4 2018–2019
Dichloromethane
3.32 µg/L 66%
of the EPA limit 5 µg/L
worst single sample: 3.4 µg/L
2/332 SYR4 2012–2019
Monochloroacetic Acid
2.59 µg/L
No EPA limit set
worst single sample: 2.6 µg/L
2/124 SYR4 2012–2019
62 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicBariumBenzeneBeryllium, TotalChlorobenzeneCopperCyanideCadmiumCarbon TetrachlorideChromiumDi(2-ethylhexyl) PhthalateDichloroacetic AcidEthylbenzeneHfpo-DaLeadMercuryMonobromoacetic AcidNetfosaaNfdhaNmefosaaNitritePfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPfmbaPfmpaPFNAPfpeaPfpesPftaPftrdaPfunaSeleniumStyreneThallium, TotalTolueneTrichloroacetic AcidVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
ZAKHARI, GEORGE
Phone
760-515-8322
Email
[email protected]

Frequently asked questions about Gswc-South Arcadia

Is Gswc-South Arcadia tap water safe to drink?

EPA monitoring detected 19 contaminants in Gswc-South Arcadia's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Gswc-South Arcadia's water?

EPA monitoring detected Trichloroethylene, Nitrate, Tetrachloroethylene, TTHM, Dibromochloromethane, and others. The full list with the level and data source for each is above.

How many people does Gswc-South Arcadia serve?

Gswc-South Arcadia reports serving 27,072 people in California, per its EPA record.

Has Gswc-South Arcadia had any water quality violations?

The EPA has 2 violations on file for Gswc-South Arcadia, of which 0 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.