Is Colonial Oak Wc Inc Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Private
Counties served: Monterey

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.

health-based violations

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Archived	2024-01-01 → 2024-03-31
MCL	Health-based	Archived	2024-01-01 → 2024-03-31
MCL	Health-based	Archived	2023-07-01 → 2023-09-30
MCL	Health-based	Archived	2023-07-01 → 2023-09-30
MCL	Health-based	Archived	2023-04-01 → 2023-06-30
MCL	Health-based	Archived	2023-04-01 → 2023-06-30
MCL	Health-based	Resolved	2015-07-01 → 2015-07-31
MCL	Health-based	Resolved	2015-07-01 → 2015-07-31
MCL	Health-based	Resolved	2015-07-01 → 2015-07-31
MCL	Health-based	Resolved	2015-07-01 → 2015-07-31

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.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Nitrate	11700 µg/L 117% of the EPA limit, at the 95th percentile of samples — 10000 µg/L worst single sample: 12656 µg/L	462/462	SYR4	2012–2019
Nitrate-Nitrite	11480 µg/L 115% of the EPA limit, at the 95th percentile of samples — 10000 µg/L worst single sample: 11700 µg/L	5/5	SYR4	2016–2019
Fluoride	140 µg/L 3.5% of the EPA limit 4000 µg/L	4/5	SYR4	2016–2018
Lead	0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L	4/4	LCR	2023
Chromium	31.7 µg/L 32% of the EPA limit 100 µg/L worst single sample: 34 µg/L	3/5	SYR4	2016–2018

49 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalArsenicAsbestosAtrazineBariumBenzeneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCopperCyanideCadmiumCarbon TetrachlorideChloroformDichloromethaneDalaponDibromochloromethaneDinosebDiquatEthylbenzeneLassoLeadMercuryNitritePentachlorophenolPicloramSeleniumSimazineStyreneTTHMTetrachloroethyleneThallium, TotalTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: VOCELKA, JIM
Phone: 831-663-6644
Email: MARINAMAYOR@AOL.COM

Frequently asked questions about Colonial Oak Wc Inc

Is Colonial Oak Wc Inc tap water safe to drink?

EPA monitoring detected 5 contaminants in Colonial Oak Wc Inc'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 Colonial Oak Wc Inc's water?

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

How many people does Colonial Oak Wc Inc serve?

Colonial Oak Wc Inc reports serving 198 people in California, per its EPA record.

Has Colonial Oak Wc Inc had any water quality violations?

The EPA has 66 violations on file for Colonial Oak Wc Inc, of which 54 are health-based (a contaminant limit or required treatment was breached) and 1 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.