Is Gswc - Artesia Tap Water Safe? Quality Report

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.

health-based violations

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Resolved	2005-09-01 → 2005-09-30
MCL	Health-based	Resolved	2005-09-01 → 2005-09-30
Other	Monitoring	Archived	1988-09-01 → 1988-09-30

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).

Contaminant	Max	Detection rate	Period
PFOS	0.0130 µg/L	4/10	2024
PFHXS	0.0034 µg/L	2/10	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.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Arsenic	20 µg/L 200% of the EPA limit, at the 95th percentile of samples — 10 µg/L worst single sample: 41 µg/L	2266/2585	SYR4	2012–2019
TTHM	26 µg/L 33% of the EPA limit 80 µg/L worst single sample: 31 µg/L	102/126	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	11.2 µg/L 19% of the EPA limit 60 µg/L worst single sample: 27 µg/L	97/124	SYR4	2012–2019
Dibromochloromethane	6.94 µg/L No EPA limit set worst single sample: 7.4 µg/L	93/126	SYR4	2012–2019
Dichloroacetic Acid	3.9 µg/L No EPA limit set worst single sample: 10 µg/L	93/124	SYR4	2012–2019
Trichloroacetic Acid	5.55 µg/L No EPA limit set worst single sample: 6.8 µg/L	91/124	SYR4	2012–2019
Bromodichloromethane	8.1 µg/L No EPA limit set worst single sample: 9.2 µg/L	88/126	SYR4	2012–2019
Chloroform	11 µg/L No EPA limit set worst single sample: 13 µg/L	87/126	SYR4	2012–2019
Dibromoacetic Acid	1.74 µg/L No EPA limit set worst single sample: 3.1 µg/L	73/124	SYR4	2012–2019
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	38/38	LCR	2025
Bromoform	1.735 µg/L No EPA limit set worst single sample: 2 µg/L	34/126	SYR4	2012–2019
Nitrate	2200 µg/L 22% of the EPA limit 10000 µg/L	32/102	SYR4	2012–2019
Fluoride	540.5 µg/L 14% of the EPA limit 4000 µg/L worst single sample: 550 µg/L	20/20	SYR4	2012–2018
Barium	183 µg/L 9.2% of the EPA limit 2000 µg/L worst single sample: 190 µg/L	15/20	SYR4	2012–2018
Tetrachloroethylene	0.7930 µg/L 16% of the EPA limit 5 µg/L worst single sample: 0.8000 µg/L	15/62	SYR4	2012–2019
1,1-Dichloroethylene	0.8830 µg/L 13% of the EPA limit 7 µg/L worst single sample: 0.8900 µg/L	8/62	SYR4	2012–2019
Monobromoacetic Acid	6.18 µg/L No EPA limit set worst single sample: 7.2 µg/L	7/124	SYR4	2012–2019
Trichloroethylene	0.6100 µg/L 12% of the EPA limit 5 µg/L	7/62	SYR4	2012–2019
Monochloroacetic Acid	4.125 µg/L No EPA limit set worst single sample: 4.2 µg/L	6/124	SYR4	2012–2019
Copper	6.205 µg/L 0.5% of the EPA limit 1300 µg/L worst single sample: 6.4 µg/L	4/20	SYR4	2012–2018
Nitrate-Nitrite	702220 µg/L 7022% of the EPA limit, at the 95th percentile of samples — 10000 µg/L worst single sample: 780000 µg/L	3/16	SYR4	2012–2018
Combined Uranium	4.07515 µg/L 14% of the EPA limit 30 µg/L worst single sample: 4.172 µg/L	2/8	SYR4	2012–2019
Selenium	2.2 µg/L 4.4% of the EPA limit 50 µg/L	1/20	SYR4	2012–2018

87 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined Radium (-226 And -228)DichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPfmbaPfmpaPFNAPFOAPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: FLORES, ROCIO
Phone: 626-250-1517
Email: [email protected]

Frequently asked questions about Gswc - Artesia

Is Gswc - Artesia tap water safe to drink?

EPA monitoring detected 25 contaminants in Gswc - Artesia'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 - Artesia's water?

EPA monitoring detected Arsenic, TTHM, Total Haloacetic Acids (HAA5), Dibromochloromethane, Dichloroacetic Acid, and others. The full list with the level and data source for each is above.

How many people does Gswc - Artesia serve?

Gswc - Artesia reports serving 50,415 people in California, per its EPA record.

Has Gswc - Artesia had any water quality violations?

The EPA has 3 violations on file for Gswc - Artesia, of which 2 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.