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Rincon Del Diablo Mwd (id-1)

EPA monitoring tested this supplier for 42 contaminants and detected 14. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

42
contaminants tested
14
detected
30,757
people served
4
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
SWP
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.

4
health-based violations
7
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2014-08-01 → 2014-08-31
MCL Health-based Resolved 2014-08-01 → 2014-08-31
MCL Health-based Resolved 2013-04-01 → 2013-04-30
MCL Health-based Resolved 2013-04-01 → 2013-04-30
MR Monitoring Resolved 2001-08-01
MR Monitoring Resolved 2001-08-01
Other Monitoring Archived 1989-01-01 → 1989-01-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
Pfba 0.0100 µg/L 1/2 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
Bromodichloromethane
13 µg/L
No EPA limit set
 105/105 SYR4 2012–2019
Bromoform
7.7 µg/L
No EPA limit set
 105/105 SYR4 2012–2019
Chloroform
11 µg/L
No EPA limit set
 105/105 SYR4 2012–2019
Dibromochloromethane
20 µg/L
No EPA limit set
 105/105 SYR4 2012–2019
TTHM
46 µg/L 57%
of the EPA limit 80 µg/L
 105/105 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
30 µg/L 50%
of the EPA limit 60 µg/L
 96/104 SYR4 2012–2019
Trichloroacetic Acid
6.6 µg/L
No EPA limit set
 95/104 SYR4 2012–2019
Dichloroacetic Acid
8.9 µg/L
No EPA limit set
 92/104 SYR4 2012–2019
Dibromoacetic Acid
7.3 µg/L
No EPA limit set
 60/104 SYR4 2012–2019
Monochloroacetic Acid
19 µg/L
No EPA limit set
 32/104 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 19/19 LCR 2025
Monobromoacetic Acid
3.1 µg/L
No EPA limit set
 6/104 SYR4 2012–2019
Lithium
43 µg/L
No EPA limit set
 2/2 UCMR-5 2025
28 contaminants tested, none detected
11Cl-PF3OUdS4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaHfpo-DaNetfosaaNfdhaNmefosaaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfuna

Utility contact

Contact
UMBRASAS, JEFF
Phone
760-745-5522
Email
jumbrasas@rinconwater.org

Frequently asked questions about Rincon Del Diablo Mwd (id-1)

Is Rincon Del Diablo Mwd (id-1) tap water safe to drink?

EPA monitoring detected 14 contaminants in Rincon Del Diablo Mwd (id-1)'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 Del Diablo Mwd (id-1)'s water?

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

How many people does Rincon Del Diablo Mwd (id-1) serve?

Rincon Del Diablo Mwd (id-1) reports serving 30,757 people in California, per its EPA record.

Has Rincon Del Diablo Mwd (id-1) had any water quality violations?

The EPA has 7 violations on file for Rincon Del Diablo Mwd (id-1), 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.