Is Town of Grand Coteau Water Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Local government
Counties served: St. Landry Parish

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.

101

health-based violations

206

violations on file

still open

Violation	Type	Status	Period
TT	Health-based	Resolved	2025-03-03
TT	Health-based	Resolved	2025-03-03
TT	Health-based	Resolved	2025-03-03
TT	Health-based	Resolved	2025-03-03
TT	Health-based	Resolved	2025-03-03
TT	Health-based	Resolved	2025-03-03
TT	Health-based	Unaddressed	2024-10-17
TT	Health-based	Resolved	2022-07-12
TT	Health-based	Resolved	2022-07-12
TT	Health-based	Resolved	2022-07-12

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
Copper	1460 µg/L 112% of the EPA limit, at the 95th percentile of samples — 1300 µg/L worst single sample: 2100 µg/L	33/65	SYR4	2014–2019
Lead	7 µg/L 47% of the EPA limit 15 µg/L worst single sample: 9 µg/L	21/65	SYR4	2014–2019
Nitrate-Nitrite	2370 µg/L 24% of the EPA limit 10000 µg/L worst single sample: 3000 µg/L	15/20	SYR4	2012–2019
Dibromochloromethane	4.3 µg/L No EPA limit set	14/14	SYR4	2013–2019
TTHM	11.595 µg/L 14% of the EPA limit 80 µg/L worst single sample: 12.7 µg/L	14/14	SYR4	2013–2019
Bromoform	3.86 µg/L No EPA limit set worst single sample: 6.8 µg/L	13/14	SYR4	2013–2019
Chloroform	2.08 µg/L No EPA limit set worst single sample: 2.2 µg/L	13/14	SYR4	2013–2019
Bromodichloromethane	3.305 µg/L No EPA limit set worst single sample: 3.8 µg/L	12/14	SYR4	2013–2019
Total Haloacetic Acids (HAA5)	10.165 µg/L 17% of the EPA limit 60 µg/L worst single sample: 13.3 µg/L	12/14	SYR4	2013–2019
Dibromoacetic Acid	2.5 µg/L No EPA limit set worst single sample: 2.9 µg/L	11/14	SYR4	2013–2019
Lead	0.0070 mg/L 47% of the EPA limit 0.0150 mg/L	11/11	LCR	2025
Dichloroacetic Acid	2.385 µg/L No EPA limit set worst single sample: 2.7 µg/L	10/14	SYR4	2013–2019
Nitrate	1600 µg/L 16% of the EPA limit 10000 µg/L	8/8	SYR4	2018–2019
Trichloroacetic Acid	1.295 µg/L No EPA limit set worst single sample: 1.4 µg/L	8/14	SYR4	2013–2019
Arsenic	3.7 µg/L 37% of the EPA limit 10 µg/L worst single sample: 4 µg/L	7/7	SYR4	2012–2018
Fluoride	400 µg/L 10% of the EPA limit 4000 µg/L	5/5	SYR4	2012–2018
Chromium	5.82 µg/L 5.8% of the EPA limit 100 µg/L worst single sample: 6 µg/L	4/7	SYR4	2012–2018
Barium	78.7 µg/L 3.9% of the EPA limit 2000 µg/L worst single sample: 80 µg/L	3/7	SYR4	2012–2018
Gross Beta Particle Activity	2.15 pCi/L No EPA limit set worst single sample: 2.21 pCi/L	3/15	SYR4	2012–2019
Monochloroacetic Acid	8.83 µg/L No EPA limit set worst single sample: 9.2 µg/L	3/14	SYR4	2013–2019
Di(2-ethylhexyl) Phthalate	0.7820 µg/L 13% of the EPA limit 6 µg/L worst single sample: 0.7900 µg/L	2/5	SYR4	2012–2018
Selenium	0.8885 µg/L 1.8% of the EPA limit 50 µg/L worst single sample: 0.8900 µg/L	2/7	SYR4	2012–2018
Combined Radium (-226 And -228)	0.4770 pCi/L 9.5% of the EPA limit 5 pCi/L	1/4	SYR4	2015–2018

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, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateGross Alpha, Excl. Radon And UHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidNitriteOxamylPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: RICHARD, PATRICK
Phone: 337-662-5246
Email: [email protected]

Frequently asked questions about Town of Grand Coteau Water

Is Town of Grand Coteau Water tap water safe to drink?

EPA monitoring detected 23 contaminants in Town of Grand Coteau Water'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 Town of Grand Coteau Water's water?

EPA monitoring detected Copper, Lead, Nitrate-Nitrite, Dibromochloromethane, TTHM, and others. The full list with the level and data source for each is above.

How many people does Town of Grand Coteau Water serve?

Town of Grand Coteau Water reports serving 1,650 people in Louisiana, per its EPA record.

Has Town of Grand Coteau Water had any water quality violations?

The EPA has 206 violations on file for Town of Grand Coteau Water, of which 101 are 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.