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Tap water quality report

Rancho Santa Teresa Mw Co.

EPA monitoring tested this supplier for 50 contaminants and detected 12. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

50
contaminants tested
12
detected
102
people served
75
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Ground water
Ownership
Private
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.

75
health-based violations
185
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Archived 2024-10-01 → 2024-12-31
MCL Health-based Archived 2023-10-01 → 2023-12-31
MCL Health-based Archived 2023-07-01 → 2023-09-30
MCL Health-based Resolved 2019-04-01 → 2019-06-30
MCL Health-based Resolved 2019-04-01 → 2019-06-30
MCL Health-based Resolved 2019-04-01 → 2019-06-30
MCL Health-based Resolved 2019-04-01 → 2019-06-30
MCL Health-based Resolved 2019-01-01 → 2019-03-31
MCL Health-based Resolved 2019-01-01 → 2019-03-31
MCL Health-based Resolved 2019-01-01 → 2019-03-31

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
14660 µg/L 147%
of the EPA limit, at the 95th percentile of samples — 10000 µg/L
worst single sample: 17400 µg/L
72/74 SYR4 2014–2019
Combined Uranium
223.5 µg/L 745%
of the EPA limit, at the 95th percentile of samples — 30 µg/L
worst single sample: 238.4 µg/L
58/58 SYR4 2014–2019
Lead
0.0037 mg/L 25%
of the EPA limit 0.0150 mg/L
 15/15 LCR 2025
Fluoride
143.5 µg/L 3.6%
of the EPA limit 4000 µg/L
worst single sample: 144 µg/L
6/6 SYR4 2014–2019
Barium
144 µg/L 7.2%
of the EPA limit 2000 µg/L
worst single sample: 150 µg/L
5/6 SYR4 2014–2019
Copper
97.45 µg/L 7.5%
of the EPA limit 1300 µg/L
worst single sample: 112 µg/L
4/9 SYR4 2014–2017
Arsenic
2 µg/L 20%
of the EPA limit 10 µg/L
 3/6 SYR4 2014–2019
Cyanide
20 µg/L 10%
of the EPA limit 200 µg/L
 1/6 SYR4 2014–2019
Chromium
12 µg/L 12%
of the EPA limit 100 µg/L
 1/6 SYR4 2014–2019
Dichloromethane
0.7000 µg/L 14%
of the EPA limit 5 µg/L
 1/3 SYR4 2015–2017
Lead
6 µg/L 40%
of the EPA limit 15 µg/L
 1/3 SYR4 2015
Selenium
5 µg/L 10%
of the EPA limit 50 µg/L
 1/6 SYR4 2014–2019
38 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalAsbestosAtrazineBenzeneBeryllium, TotalChlorobenzeneCadmiumCarbon TetrachlorideDalaponDinosebEthylene DibromideEthylbenzeneLassoMercuryNitritePentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
MATTERN, RALPH
Phone
858-354-5073
Email
[email protected]

Frequently asked questions about Rancho Santa Teresa Mw Co.

Is Rancho Santa Teresa Mw Co. tap water safe to drink?

EPA monitoring detected 12 contaminants in Rancho Santa Teresa Mw Co.'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 Rancho Santa Teresa Mw Co.'s water?

EPA monitoring detected Nitrate, Combined Uranium, Lead, Fluoride, Barium, and others. The full list with the level and data source for each is above.

How many people does Rancho Santa Teresa Mw Co. serve?

Rancho Santa Teresa Mw Co. reports serving 102 people in California, per its EPA record.

Has Rancho Santa Teresa Mw Co. had any water quality violations?

The EPA has 185 violations on file for Rancho Santa Teresa Mw Co., of which 75 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.