Is City of San Jose - Nsj/Alviso Tap Water Safe? Quality Report

Water source: SWP
Ownership: Local government
Counties served: Santa Clara

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	2008-04-01 → 2008-04-30
MCL	Health-based	Resolved	2008-04-01 → 2008-04-30
TT	Health-based	Resolved	1995-03-01 → 1995-03-31
TT	Health-based	Resolved	1995-03-01 → 1995-03-31
TT	Health-based	Resolved	1992-04-01 → 1992-04-30
TT	Health-based	Resolved	1992-04-01 → 1992-04-30
TT	Health-based	Resolved	1992-04-01 → 1992-04-30
TT	Health-based	Resolved	1992-04-01 → 1992-04-30
TT	Health-based	Resolved	1992-04-01 → 1992-04-30
MR	Monitoring	Resolved	2005-12-01 → 2005-12-31

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
Chloroform	60.929 µg/L No EPA limit set worst single sample: 64.83 µg/L	123/123	SYR4	2012–2019
TTHM	62.021 µg/L 78% of the EPA limit 80 µg/L worst single sample: 68.22 µg/L	123/123	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	52.515 µg/L 88% of the EPA limit 60 µg/L worst single sample: 61.6 µg/L	118/119	SYR4	2012–2019
Dichloroacetic Acid	30.22 µg/L No EPA limit set worst single sample: 34.4 µg/L	117/119	SYR4	2012–2019
Trichloroacetic Acid	23.25 µg/L No EPA limit set worst single sample: 30.3 µg/L	116/119	SYR4	2012–2019
Bromodichloromethane	7.495 µg/L No EPA limit set worst single sample: 9.25 µg/L	91/123	SYR4	2012–2019
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	36/36	LCR	2024
Nitrate	3331.5 µg/L 33% of the EPA limit 10000 µg/L worst single sample: 3390 µg/L	34/36	SYR4	2012–2019
Dibromochloromethane	4.64 µg/L No EPA limit set worst single sample: 4.8 µg/L	17/123	SYR4	2012–2019
Monochloroacetic Acid	3.54 µg/L No EPA limit set worst single sample: 3.9 µg/L	13/119	SYR4	2012–2019
Bromoform	4 µg/L No EPA limit set	9/123	SYR4	2012–2019
Barium	240 µg/L 12% of the EPA limit 2000 µg/L worst single sample: 250 µg/L	6/6	SYR4	2014–2017
Dibromoacetic Acid	4.5 µg/L No EPA limit set worst single sample: 5.4 µg/L	6/119	SYR4	2012–2019
Nitrate-Nitrite	520660 µg/L 5207% of the EPA limit, at the 95th percentile of samples — 10000 µg/L worst single sample: 650000 µg/L	5/5	SYR4	2014–2017
Fluoride	128.5 µg/L 3.2% of the EPA limit 4000 µg/L worst single sample: 130 µg/L	4/7	SYR4	2014–2017
Selenium	7.36 µg/L 15% of the EPA limit 50 µg/L worst single sample: 7.5 µg/L	3/6	SYR4	2014–2017
Lithium	9.3 µg/L No EPA limit set	3/8	UCMR-5	2023
Arsenic	2.2 µg/L 22% of the EPA limit 10 µg/L	1/6	SYR4	2014–2017
Asbestos	0.7000 MFL 10% of the EPA limit 7 MFL	1/4	SYR4	2017

91 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 TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorMonobromoacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: TANG, JOHN
Phone: 408-277-3288
Email: John.tang@sanjoseca.gov

Frequently asked questions about City of San Jose - Nsj/Alviso

Is City of San Jose - Nsj/Alviso tap water safe to drink?

EPA monitoring detected 19 contaminants in City of San Jose - Nsj/Alviso'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 City of San Jose - Nsj/Alviso's water?

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

How many people does City of San Jose - Nsj/Alviso serve?

City of San Jose - Nsj/Alviso reports serving 45,559 people in California, per its EPA record.

Has City of San Jose - Nsj/Alviso had any water quality violations?

The EPA has 10 violations on file for City of San Jose - Nsj/Alviso, of which 9 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.