Is Colonial Park Tap Water Safe? Quality Report

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

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
MR	Monitoring	Resolved	2011-10-01 → 2011-10-31
MR	Monitoring	Resolved	2011-10-01 → 2011-10-31
MR	Monitoring	Resolved	2007-01-01 → 2007-12-31
MR	Monitoring	Resolved	2007-01-01 → 2007-12-31
MR	Monitoring	Resolved	2006-01-01 → 2006-12-31
MR	Monitoring	Resolved	2006-01-01 → 2006-12-31
MR	Monitoring	Resolved	2001-03-01
MR	Monitoring	Resolved	2001-03-01
MR	Monitoring	Resolved	1993-07-01
Other	Monitoring	Archived	1984-09-01 → 1984-09-30

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
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	14/14	LCR	2024
Arsenic	19.2 µg/L 192% of the EPA limit, at the 95th percentile of samples — 10 µg/L worst single sample: 21 µg/L	13/13	SYR4	2012–2019
Dibromochloromethane	16.62 µg/L No EPA limit set worst single sample: 18 µg/L	3/3	SYR4	2014–2018
TTHM	39.9 µg/L 50% of the EPA limit 80 µg/L worst single sample: 42 µg/L	3/3	SYR4	2014–2018
Bromodichloromethane	7.355 µg/L No EPA limit set worst single sample: 7.4 µg/L	2/3	SYR4	2014–2018
Bromoform	13.3385 µg/L No EPA limit set worst single sample: 14 µg/L	2/3	SYR4	2014–2018
Chloroform	9.235 µg/L No EPA limit set worst single sample: 9.6 µg/L	2/3	SYR4	2014–2018
Dibromoacetic Acid	3.8265 µg/L No EPA limit set worst single sample: 3.97 µg/L	2/3	SYR4	2014–2018
Fluoride	299 µg/L 7.5% of the EPA limit 4000 µg/L worst single sample: 300 µg/L	2/2	SYR4	2012–2014
Total Haloacetic Acids (HAA5)	8.1395 µg/L 14% of the EPA limit 60 µg/L worst single sample: 8.51 µg/L	2/3	SYR4	2014–2018
Dichloroacetic Acid	2.81 µg/L No EPA limit set	1/3	SYR4	2014–2018
Trichloroacetic Acid	1.73 µg/L No EPA limit set	1/3	SYR4	2014–2018

58 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, TotalAsbestosAtrazineBhc-GammaBariumBenzeneBeryllium, TotalChlorobenzeneCopperCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNitrateNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: ETCHELL, GREGORY
Phone: 707-888-2554
Email: gregger2k@gmail.com

Frequently asked questions about Colonial Park

Is Colonial Park tap water safe to drink?

EPA monitoring detected 12 contaminants in Colonial Park'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 Park's water?

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

How many people does Colonial Park serve?

Colonial Park reports serving 342 people in California, per its EPA record.

Has Colonial Park had any water quality violations?

The EPA has 14 violations on file for Colonial Park, of which 0 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.