Is Chelsea Economic Dev. Auth. Tap Water Safe? Quality Report

Water source: Surface water
Ownership: Local government
Counties served: Rogers

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

188

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Resolved	2009-10-01 → 2009-12-31
MCL	Health-based	Resolved	2009-10-01 → 2009-12-31
MCL	Health-based	Resolved	2009-10-01 → 2009-12-31
MCL	Health-based	Resolved	2009-07-01 → 2009-09-30
MCL	Health-based	Resolved	2009-07-01 → 2009-09-30
MCL	Health-based	Resolved	2009-07-01 → 2009-09-30
MCL	Health-based	Resolved	2009-04-01 → 2009-06-30
MCL	Health-based	Resolved	2009-04-01 → 2009-06-30
MCL	Health-based	Resolved	2009-04-01 → 2009-06-30
MCL	Health-based	Resolved	2009-01-01 → 2009-03-31

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.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Bromodichloromethane	15.05 µg/L No EPA limit set worst single sample: 19.01 µg/L	51/51	SYR4	2012–2019
Copper	767 µg/L 59% of the EPA limit 1300 µg/L worst single sample: 1640 µg/L	51/65	SYR4	2012–2019
Chloroform	56.45 µg/L No EPA limit set worst single sample: 68.9 µg/L	51/51	SYR4	2012–2019
Dibromochloromethane	7.55 µg/L No EPA limit set worst single sample: 8.76 µg/L	51/51	SYR4	2012–2019
TTHM	71.98 µg/L 90% of the EPA limit 80 µg/L worst single sample: 86.2 µg/L	49/49	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	71.58 µg/L 119% of the EPA limit, at the 95th percentile of samples — 60 µg/L worst single sample: 88.4 µg/L	49/49	SYR4	2012–2019
Trichloroacetic Acid	35.52 µg/L No EPA limit set worst single sample: 43.8 µg/L	49/49	SYR4	2012–2019
Dichloroacetic Acid	35.906 µg/L No EPA limit set worst single sample: 44.6 µg/L	48/49	SYR4	2012–2019
Dibromoacetic Acid	2.7945 µg/L No EPA limit set worst single sample: 3.11 µg/L	30/49	SYR4	2012–2019
Lead	0.0043 mg/L 29% of the EPA limit 0.0150 mg/L	15/15	LCR	2025
Nitrate-Nitrite	640 µg/L 6.4% of the EPA limit 10000 µg/L	14/14	SYR4	2012–2019
Lead	45.4895 µg/L 303% of the EPA limit, at the 95th percentile of samples — 15 µg/L worst single sample: 62 µg/L	7/65	SYR4	2012–2019
Monochloroacetic Acid	4.864 µg/L No EPA limit set worst single sample: 4.87 µg/L	5/49	SYR4	2012–2019
Bromoform	1.08 µg/L No EPA limit set	2/51	SYR4	2012–2019
Barium	50 µg/L 2.5% of the EPA limit 2000 µg/L	1/1	SYR4	2017
Fluoride	150 µg/L 3.8% of the EPA limit 4000 µg/L	1/1	SYR4	2017
Gross Beta Particle Activity	2.57 pCi/L No EPA limit set	1/1	SYR4	2017

33 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-DichloropropaneAntimony, TotalArsenicBenzeneBeryllium, TotalChlorobenzeneCadmiumCarbon TetrachlorideChromiumCombined Radium (-226 And -228)Combined UraniumDichloromethaneEthylbenzeneGross Alpha, Excl. Radon And UMercuryMonobromoacetic AcidSeleniumStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: CHELSEA ECONOMIC DEV. AUTH.
Phone: 918-789-2558
Email: [email protected]

Frequently asked questions about Chelsea Economic Dev. Auth.

Is Chelsea Economic Dev. Auth. tap water safe to drink?

EPA monitoring detected 17 contaminants in Chelsea Economic Dev. Auth.'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 Chelsea Economic Dev. Auth.'s water?

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

How many people does Chelsea Economic Dev. Auth. serve?

Chelsea Economic Dev. Auth. reports serving 1,964 people in Oklahoma, per its EPA record.

Has Chelsea Economic Dev. Auth. had any water quality violations?

The EPA has 188 violations on file for Chelsea Economic Dev. Auth., of which 29 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.