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Tap water quality report

City of Paso Robles Water Division

EPA monitoring tested this supplier for 111 contaminants and detected 28. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

111
contaminants tested
28
detected
31,176
people served
2
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Surface water
Ownership
Local government
Counties served
San Luis Obispo

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
7
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 1993-06-01 → 1993-06-30
TT Health-based Resolved 1993-06-01 → 1993-06-30
MR Monitoring Resolved 2015-06-01
MR Monitoring Resolved 2015-06-01
MR Monitoring Resolved 2008-04-01 → 2008-04-30
MR Monitoring Resolved 2008-04-01 → 2008-04-30
MR Monitoring Resolved 1993-06-30 → 2000-03-01

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
PFBS 0.0081 µg/L 5/23 2025
PFHXS 0.0052 µg/L 5/23 2025
Pfhpa 0.0063 µg/L 2/23 2025
Pfhxa 0.0200 µg/L 2/23 2025
PFOA 0.0063 µg/L 2/23 2025
Pfpea 0.0220 µg/L 2/23 2025
Pfba 0.0061 µg/L 1/23 2025

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
Arsenic
36 µg/L 360%
of the EPA limit, in the worst sample — 10 µg/L
 291/371 SYR4 2012–2019
Nitrate
7232 µg/L 72%
of the EPA limit 10000 µg/L
 232/306 SYR4 2012–2019
TTHM
83 µg/L 104%
of the EPA limit, in the worst sample — 80 µg/L
 87/93 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
24.4 µg/L 41%
of the EPA limit 60 µg/L
 87/87 SYR4 2012–2019
Bromodichloromethane
17 µg/L
No EPA limit set
 86/93 SYR4 2012–2019
Chloroform
27 µg/L
No EPA limit set
 83/93 SYR4 2012–2019
Dibromochloromethane
30 µg/L
No EPA limit set
 83/93 SYR4 2012–2019
Selenium
41 µg/L 82%
of the EPA limit 50 µg/L
 79/123 SYR4 2012–2019
Dichloroacetic Acid
10.3 µg/L
No EPA limit set
 74/87 SYR4 2012–2019
Dibromoacetic Acid
13.2 µg/L
No EPA limit set
 69/87 SYR4 2012–2019
Bromoform
41 µg/L
No EPA limit set
 67/93 SYR4 2012–2019
Fluoride
960 µg/L 24%
of the EPA limit 4000 µg/L
 55/55 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 46/46 LCR 2025
Trichloroacetic Acid
13 µg/L
No EPA limit set
 46/87 SYR4 2012–2019
Combined Uranium
11.175 µg/L 37%
of the EPA limit 30 µg/L
 45/45 SYR4 2012–2019
Barium
330 µg/L 17%
of the EPA limit 2000 µg/L
 25/55 SYR4 2012–2019
Nitrate-Nitrite
980000 µg/L 9800%
of the EPA limit, in the worst sample — 10000 µg/L
 25/37 SYR4 2012–2019
Lithium
46.2 µg/L
No EPA limit set
 19/23 UCMR-5 2025
Monobromoacetic Acid
2.1 µg/L
No EPA limit set
 6/87 SYR4 2012–2019
Monochloroacetic Acid
3.5 µg/L
No EPA limit set
 3/87 SYR4 2012–2019
Lead
7.1 µg/L 47%
of the EPA limit 15 µg/L
 1/55 SYR4 2012–2019
83 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, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCopperCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfdaPfdoaPfeesaPfhpsPfmbaPfmpaPFNAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
GONZALEZ, KIRK
Phone
805-237-3861
Email
KGonzalez@prcity.com

Frequently asked questions about City of Paso Robles Water Division

Is City of Paso Robles Water Division tap water safe to drink?

EPA monitoring detected 28 contaminants in City of Paso Robles Water Division'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 Paso Robles Water Division's water?

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

How many people does City of Paso Robles Water Division serve?

City of Paso Robles Water Division reports serving 31,176 people in California, per its EPA record.

Has City of Paso Robles Water Division had any water quality violations?

The EPA has 7 violations on file for City of Paso Robles Water Division, 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.