Tap WaterIndex

← California

Tap water quality report

Rohnert Park, City of

EPA monitoring tested this supplier for 108 contaminants and detected 24. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

108
contaminants tested
24
detected
43,821
people served
4
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Ground water
Ownership
Local government
Counties served
Sonoma

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
556
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2011-04-01 → 2011-04-30
MCL Health-based Resolved 2011-04-01 → 2011-04-30
MCL Health-based Resolved 2000-06-01 → 2000-06-30
MCL Health-based Resolved 2000-06-01 → 2000-06-30
MON Monitoring Resolved 2021-07-01 → 2021-07-31
MON Monitoring Resolved 2021-07-01 → 2021-07-31
MR Monitoring Resolved 2021-04-01 → 2021-06-30
MR Monitoring Resolved 2021-04-01 → 2021-06-30
MR Monitoring Resolved 2017-01-01 → 2017-12-31
MR Monitoring Resolved 2017-01-01 → 2017-12-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
PFHXS 0.0057 µg/L 2/16 2024
6:2 Fts 0.0071 µg/L 1/16 2024
PFOS 0.0045 µg/L 1/16 2024

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
Nitrate
9944 µg/L 99%
of the EPA limit 10000 µg/L
 428/518 SYR4 2012–2019
Arsenic
9.9 µg/L 99%
of the EPA limit 10 µg/L
 87/96 SYR4 2012–2019
TTHM
28.12 µg/L 35%
of the EPA limit 80 µg/L
 57/60 SYR4 2012–2019
Bromodichloromethane
8 µg/L
No EPA limit set
 56/60 SYR4 2012–2019
Chloroform
17.16 µg/L
No EPA limit set
 56/60 SYR4 2012–2019
Dibromochloromethane
8 µg/L
No EPA limit set
 56/60 SYR4 2012–2019
Dichloroacetic Acid
8.6 µg/L
No EPA limit set
 50/64 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
16.4 µg/L 27%
of the EPA limit 60 µg/L
 50/64 SYR4 2012–2019
Dibromoacetic Acid
3.5 µg/L
No EPA limit set
 47/64 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 28/28 LCR 2025
Trichloroacetic Acid
7.8 µg/L
No EPA limit set
 28/64 SYR4 2012–2019
Fluoride
170 µg/L 4.3%
of the EPA limit 4000 µg/L
 24/46 SYR4 2012–2019
Bromoform
3 µg/L
No EPA limit set
 19/60 SYR4 2012–2019
Lithium
39 µg/L
No EPA limit set
 13/16 UCMR-5 2024
Barium
170 µg/L 8.5%
of the EPA limit 2000 µg/L
 11/37 SYR4 2012–2019
Nitrate-Nitrite
8100 µg/L 81%
of the EPA limit 10000 µg/L
 9/16 SYR4 2017–2019
Lead
8.6 µg/L 57%
of the EPA limit 15 µg/L
 6/30 SYR4 2012–2015
Combined Uranium
12.6948 µg/L 42%
of the EPA limit 30 µg/L
 5/5 SYR4 2013–2019
Copper
79 µg/L 6.1%
of the EPA limit 1300 µg/L
 1/74 SYR4 2012–2019
Selenium
5.1 µg/L 10%
of the EPA limit 50 µg/L
 1/37 SYR4 2012–2019
Toluene
1 µg/L 0.1%
of the EPA limit 1000 µg/L
 1/34 SYR4 2012–2019
84 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPfmbaPfmpaPFNAPFOAPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
HENDERSEN, MARK
Phone
707-588-3316
Email
mhendersen@rpcity.org

Frequently asked questions about Rohnert Park, City of

Is Rohnert Park, City of tap water safe to drink?

EPA monitoring detected 24 contaminants in Rohnert Park, City of'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 Rohnert Park, City of's water?

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

How many people does Rohnert Park, City of serve?

Rohnert Park, City of reports serving 43,821 people in California, per its EPA record.

Has Rohnert Park, City of had any water quality violations?

The EPA has 556 violations on file for Rohnert Park, City of, 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.