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Tap water quality report

R Ranch at the Lake

EPA monitoring tested this supplier for 65 contaminants and detected 5. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

65
contaminants tested
5
detected
28
people served
1
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Ground water
Ownership
Private
Counties served
Napa

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.

1
health-based violations
29
violations on file
2
still open
ViolationTypeStatusPeriod
TT Health-based Unaddressed 2024-10-17
RPT Monitoring Unaddressed 2024-10-17
MR Monitoring Resolved 2024-10-01
MR Monitoring Resolved 2024-10-01
MON Monitoring Resolved 2022-07-01 → 2022-09-30
MON Monitoring Resolved 2022-07-01 → 2022-09-30
MR Monitoring Resolved 2021-10-01
MR Monitoring Resolved 2021-10-01
Other Monitoring Resolved 2017-07-01
Other Monitoring Resolved 2017-07-01

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
519.8 µg/L 5.2%
of the EPA limit 10000 µg/L
 20/36 SYR4 2013–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 17/17 LCR 2025
Barium
202 µg/L 10%
of the EPA limit 2000 µg/L
worst single sample: 210 µg/L
9/9 SYR4 2013–2019
Fluoride
110 µg/L 2.8%
of the EPA limit 4000 µg/L
 4/9 SYR4 2013–2019
Chromium
8.98 µg/L 9%
of the EPA limit 100 µg/L
worst single sample: 9.3 µg/L
3/9 SYR4 2013–2019
60 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, TotalArsenicAsbestosAtrazineBhc-GammaBenzeneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCopperCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformDichloromethaneDalaponDibromochloromethaneDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneHeptachlorHeptachlor EpoxideLassoLeadMercuryMethoxychlorNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTTHMTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
HANKES, BRANDON
Phone
707-252-0140
Email
ranchmanager@rranch.info

Frequently asked questions about R Ranch at the Lake

Is R Ranch at the Lake tap water safe to drink?

EPA monitoring detected 5 contaminants in R Ranch at the Lake'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 R Ranch at the Lake's water?

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

How many people does R Ranch at the Lake serve?

R Ranch at the Lake reports serving 28 people in California, per its EPA record.

Has R Ranch at the Lake had any water quality violations?

The EPA has 29 violations on file for R Ranch at the Lake, of which 1 is health-based (a contaminant limit or required treatment was breached) and 2 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.