Tap WaterIndex

← California

Tap water quality report

Rincon Northern

EPA monitoring tested this supplier for 103 contaminants and detected 16. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

103
contaminants tested
16
detected
7,003
people served
4
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Ground water
Ownership
Native American

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
88
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2005-08-01 → 2005-08-31
MCL Health-based Resolved 2000-07-01 → 2000-07-31
MCL Health-based Resolved 2000-05-01 → 2000-05-31
MCL Health-based Resolved 1997-08-01 → 1997-08-31
MON Monitoring Resolved 2016-11-01 → 2016-11-30
MR Monitoring Resolved 2013-08-01
MR Monitoring Resolved 2007-09-01 → 2007-09-30
MR Monitoring Resolved 2006-11-01 → 2006-11-30
MR Monitoring Resolved 2005-11-01 → 2005-11-30
MR Monitoring Resolved 2005-01-01 → 2005-12-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
PFBS 0.0034 µg/L 1/6 2024
Pfhxa 0.0059 µg/L 1/6 2024
PFOA 0.0056 µg/L 1/6 2024
PFOS 0.0089 µg/L 1/6 2024
Pfpea 0.0050 µg/L 1/6 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 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
4233 µg/L 42%
of the EPA limit 10000 µg/L
worst single sample: 5620 µg/L
40/48 SYR4 2012–2019
Lead
0.0050 mg/L 33%
of the EPA limit 0.0150 mg/L
 29/29 LCR 2025
Gross Alpha, Excl. Radon And U
5.995 pCi/L 40%
of the EPA limit 15 pCi/L
worst single sample: 6.25 pCi/L
7/7 SYR4 2014–2018
TTHM
23.06 µg/L 29%
of the EPA limit 80 µg/L
worst single sample: 25.08 µg/L
6/6 SYR4 2014–2019
Total Haloacetic Acids (HAA5)
9.0175 µg/L 15%
of the EPA limit 60 µg/L
worst single sample: 9.39 µg/L
6/6 SYR4 2014–2019
Fluoride
404.5 µg/L 10%
of the EPA limit 4000 µg/L
worst single sample: 430 µg/L
4/4 SYR4 2014–2019
Combined Uranium
5.7961 µg/L 19%
of the EPA limit 30 µg/L
worst single sample: 5.96 µg/L
3/7 SYR4 2014–2018
Barium
75.15 µg/L 3.8%
of the EPA limit 2000 µg/L
worst single sample: 77 µg/L
2/4 SYR4 2014–2019
Copper
46.35 µg/L 3.6%
of the EPA limit 1300 µg/L
worst single sample: 48 µg/L
2/3 SYR4 2017
Lead
4 µg/L 27%
of the EPA limit 15 µg/L
 1/4 SYR4 2014–2017
Nitrite
150 µg/L 15%
of the EPA limit 1000 µg/L
 1/4 SYR4 2014–2018
87 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, TotalArsenicAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined Radium (-226 And -228)DichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaOxamylPfbaPfdaPfdoaPfeesaPfhpaPfhpsPFHXSPfmbaPfmpaPFNAPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
Steve Stallings
Phone
7607491051
Email
[email protected]

Frequently asked questions about Rincon Northern

Is Rincon Northern tap water safe to drink?

EPA monitoring detected 16 contaminants in Rincon Northern'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 Rincon Northern's water?

EPA monitoring detected Nitrate, Lead, Gross Alpha, Excl. Radon And U, TTHM, Total Haloacetic Acids (HAA5), and others. The full list with the level and data source for each is above.

How many people does Rincon Northern serve?

Rincon Northern reports serving 7,003 people in California, per its EPA record.

Has Rincon Northern had any water quality violations?

The EPA has 88 violations on file for Rincon Northern, 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.