Is Gswc - Southwest Tap Water Safe? Quality Report

Water source: SWP
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	2011-11-01 → 2011-11-30
MCL	Health-based	Resolved	2011-11-01 → 2011-11-30
MR	Monitoring	Resolved	2014-11-21
MR	Monitoring	Resolved	2014-11-21
MR	Monitoring	Resolved	2007-06-01 → 2007-06-30
MR	Monitoring	Resolved	2007-06-01 → 2007-06-30

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
Bromodichloromethane	18 µg/L No EPA limit set worst single sample: 26 µg/L	276/280	SYR4	2012–2019
TTHM	59.25 µg/L 74% of the EPA limit 80 µg/L worst single sample: 81 µg/L	276/280	SYR4	2012–2019
Dibromochloromethane	17 µg/L No EPA limit set worst single sample: 25 µg/L	275/280	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	27.4 µg/L 46% of the EPA limit 60 µg/L worst single sample: 37 µg/L	273/280	SYR4	2012–2019
Bromoform	9.76 µg/L No EPA limit set worst single sample: 14 µg/L	269/280	SYR4	2012–2019
Chloroform	20 µg/L No EPA limit set worst single sample: 40 µg/L	269/280	SYR4	2012–2019
Dibromoacetic Acid	5.71 µg/L No EPA limit set worst single sample: 7.2 µg/L	259/280	SYR4	2012–2019
Dichloroacetic Acid	11 µg/L No EPA limit set worst single sample: 18 µg/L	251/280	SYR4	2012–2019
Trichloroacetic Acid	8.87 µg/L No EPA limit set worst single sample: 17 µg/L	194/280	SYR4	2012–2019
Fluoride	697.5 µg/L 17% of the EPA limit 4000 µg/L worst single sample: 840 µg/L	116/116	SYR4	2012–2019
Monochloroacetic Acid	5.64 µg/L No EPA limit set worst single sample: 6.8 µg/L	73/280	SYR4	2012–2019
Monobromoacetic Acid	2.1 µg/L No EPA limit set worst single sample: 3.1 µg/L	41/280	SYR4	2012–2019
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	38/38	LCR	2022
Barium	120 µg/L 6% of the EPA limit 2000 µg/L	5/30	SYR4	2012–2017
Combined Uranium	5.215 µg/L 17% of the EPA limit 30 µg/L worst single sample: 5.96 µg/L	5/18	SYR4	2015–2019
Arsenic	2.94 µg/L 29% of the EPA limit 10 µg/L worst single sample: 3 µg/L	4/30	SYR4	2012–2017
Lithium	51.3 µg/L No EPA limit set	4/18	UCMR-5	2025

94 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-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, TotalAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCopperCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined Radium (-226 And -228)DichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitrateNitrate-NitriteNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: SCHULTISE, DAVE
Phone: 310-263-4141
Email: [email protected]

Frequently asked questions about Gswc - Southwest

Is Gswc - Southwest tap water safe to drink?

EPA monitoring detected 17 contaminants in Gswc - Southwest'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 - Southwest's water?

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

How many people does Gswc - Southwest serve?

Gswc - Southwest reports serving 277,740 people in California, per its EPA record.

Has Gswc - Southwest had any water quality violations?

The EPA has 6 violations on file for Gswc - Southwest, 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.