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Tap water quality report

San Diego County Water Authority

EPA monitoring tested this supplier for 82 contaminants and detected 20. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

82
contaminants tested
20
detected
0
people served
2
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Surface water
Ownership
Local government
Counties served
San Diego

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.

2
health-based violations
2
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2019-04-01 → 2019-04-30
TT Health-based Resolved 2019-04-01 → 2019-04-30

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 single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Bromodichloromethane
27 µg/L
No EPA limit set
 197/197 SYR4 2012–2019
Chloroform
47 µg/L
No EPA limit set
 197/197 SYR4 2012–2019
Dibromochloromethane
26 µg/L
No EPA limit set
 197/197 SYR4 2012–2019
TTHM
80 µg/L 100%
of the EPA limit 80 µg/L
 197/197 SYR4 2012–2019
Bromoform
12 µg/L
No EPA limit set
 195/197 SYR4 2012–2019
Fluoride
940 µg/L 24%
of the EPA limit 4000 µg/L
 173/173 SYR4 2012–2019
Dichloroacetic Acid
9.6 µg/L
No EPA limit set
 124/163 SYR4 2012–2019
Dibromoacetic Acid
5.1 µg/L
No EPA limit set
 114/163 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
24 µg/L 40%
of the EPA limit 60 µg/L
 113/163 SYR4 2012–2019
Bromate
15 µg/L 150%
of the EPA limit, in the worst sample — 10 µg/L
 91/91 SYR4 2012–2019
Trichloroacetic Acid
9.4 µg/L
No EPA limit set
 41/163 SYR4 2012–2019
Nitrate
630 µg/L 6.3%
of the EPA limit 10000 µg/L
 40/228 SYR4 2012–2019
Combined Uranium
4.9766 µg/L 17%
of the EPA limit 30 µg/L
 33/35 SYR4 2012–2019
Arsenic
3.4 µg/L 34%
of the EPA limit 10 µg/L
 13/16 SYR4 2012–2019
Gross Beta Particle Activity
7.5 pCi/L
No EPA limit set
 11/24 SYR4 2012–2019
Nitrate-Nitrite
620 µg/L 6.2%
of the EPA limit 10000 µg/L
 6/28 SYR4 2012–2019
Barium
120 µg/L 6%
of the EPA limit 2000 µg/L
 3/15 SYR4 2012–2019
Dichloromethane
0.5800 µg/L 12%
of the EPA limit 5 µg/L
 3/43 SYR4 2012–2019
Monobromoacetic Acid
2.4 µg/L
No EPA limit set
 2/163 SYR4 2012–2019
Monochloroacetic Acid
2.5 µg/L
No EPA limit set
 2/163 SYR4 2012–2019
62 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,3,7,8-TCDD2,4,5-TP2,4-DAntimony, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCopperCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
DENHAM, DAN
Phone
858-522-6600
Email
ddenham@sdcwa.org

Frequently asked questions about San Diego County Water Authority

Is San Diego County Water Authority tap water safe to drink?

EPA monitoring detected 20 contaminants in San Diego County Water Authority'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 Diego County Water Authority's water?

EPA monitoring detected Bromodichloromethane, Chloroform, Dibromochloromethane, TTHM, Bromoform, and others. The full list with the level and data source for each is above.

How many people does San Diego County Water Authority serve?

San Diego County Water Authority reports serving 0 people in California, per its EPA record.

Has San Diego County Water Authority had any water quality violations?

The EPA has 2 violations on file for San Diego County Water Authority, 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.