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Tap water quality report

San Juan Vista

EPA monitoring tested this supplier for 39 contaminants and detected 10. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

39
contaminants tested
10
detected
201
people served
4
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Ground water
Ownership
Private
Counties served
San Joaquin

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.

4
health-based violations
15
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2013-08-01 → 2013-08-31
MCL Health-based Resolved 2013-08-01 → 2013-08-31
MCL Health-based Resolved 2010-08-01 → 2010-08-31
MCL Health-based Resolved 2010-08-01 → 2010-08-31
Other Monitoring Resolved 2012-07-01
Other Monitoring Resolved 2012-07-01
Other Monitoring Resolved 2009-07-01
Other Monitoring Resolved 2009-07-01
Other Monitoring Resolved 2008-07-01
Other Monitoring Resolved 2005-07-01

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
Nitrate
4248.8 µg/L 42%
of the EPA limit 10000 µg/L
 16/16 SYR4 2012–2019
1,2-DIBROMO-3-CHLOROPROPANE
0.0592 µg/L 30%
of the EPA limit 0.2000 µg/L
worst single sample: 0.0700 µg/L
6/8 SYR4 2013–2019
Lead
0.0026 mg/L 17%
of the EPA limit 0.0150 mg/L
 6/6 LCR 2024
Tetrachloroethylene
5.66 µg/L 113%
of the EPA limit, at the 95th percentile of samples — 5 µg/L
worst single sample: 5.8 µg/L
5/6 SYR4 2012–2019
Arsenic
9.424 µg/L 94%
of the EPA limit 10 µg/L
worst single sample: 9.46 µg/L
3/3 SYR4 2013–2019
Barium
119 µg/L 5.9%
of the EPA limit 2000 µg/L
worst single sample: 120 µg/L
3/3 SYR4 2013–2019
Nitrate-Nitrite
4130 µg/L 41%
of the EPA limit 10000 µg/L
worst single sample: 4200 µg/L
2/2 SYR4 2016–2019
Copper
99.3 µg/L 7.6%
of the EPA limit 1300 µg/L
 1/3 SYR4 2013–2019
Fluoride
110 µg/L 2.8%
of the EPA limit 4000 µg/L
 1/3 SYR4 2013–2019
Lead
5.15 µg/L 34%
of the EPA limit 15 µg/L
 1/3 SYR4 2013–2019
29 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-DichloropropaneAntimony, TotalBenzeneBeryllium, TotalChlorobenzeneCadmiumCarbon TetrachlorideChromiumDichloromethaneEthylene DibromideEthylbenzeneMercuryNitriteSeleniumStyreneThallium, TotalTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
CASTELLON, MARIA
Phone
209-662-9627
Email
[email protected]

Frequently asked questions about San Juan Vista

Is San Juan Vista tap water safe to drink?

EPA monitoring detected 10 contaminants in San Juan Vista'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 San Juan Vista's water?

EPA monitoring detected Nitrate, 1,2-DIBROMO-3-CHLOROPROPANE, Lead, Tetrachloroethylene, Arsenic, and others. The full list with the level and data source for each is above.

How many people does San Juan Vista serve?

San Juan Vista reports serving 201 people in California, per its EPA record.

Has San Juan Vista had any water quality violations?

The EPA has 15 violations on file for San Juan Vista, of which 4 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.