Is Port of West St Mary Tap Water Safe? Quality Report

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

144

health-based violations

185

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Archived	2025-07-01 → 2025-09-30
MCL	Health-based	Archived	2025-07-01 → 2025-09-30
MCL	Health-based	Archived	2025-07-01 → 2025-09-30
MCL	Health-based	Resolved	2019-10-01 → 2019-12-31
MCL	Health-based	Resolved	2019-10-01 → 2019-12-31
MCL	Health-based	Resolved	2019-10-01 → 2019-12-31
MCL	Health-based	Resolved	2019-10-01 → 2019-12-31
MCL	Health-based	Resolved	2019-10-01 → 2019-12-31
MCL	Health-based	Resolved	2019-10-01 → 2019-12-31
MCL	Health-based	Resolved	2019-10-01 → 2019-12-31

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	42.7 µg/L No EPA limit set worst single sample: 59 µg/L	47/47	SYR4	2012–2019
Chloroform	49.19 µg/L No EPA limit set worst single sample: 81 µg/L	47/47	SYR4	2012–2019
TTHM	126.58 µg/L 158% of the EPA limit, at the 95th percentile of samples — 80 µg/L worst single sample: 175.6 µg/L	47/47	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	59.16 µg/L 99% of the EPA limit 60 µg/L worst single sample: 71 µg/L	45/47	SYR4	2012–2019
Dichloroacetic Acid	18.885 µg/L No EPA limit set worst single sample: 27.8 µg/L	44/47	SYR4	2012–2019
Dibromoacetic Acid	7.05 µg/L No EPA limit set worst single sample: 13 µg/L	43/47	SYR4	2012–2019
Dibromochloromethane	33.62 µg/L No EPA limit set worst single sample: 38.7 µg/L	43/47	SYR4	2012–2019
Bromoform	4.68 µg/L No EPA limit set worst single sample: 6.8 µg/L	42/47	SYR4	2012–2019
Trichloroacetic Acid	22.7 µg/L No EPA limit set worst single sample: 30.7 µg/L	41/47	SYR4	2012–2019
Monochloroacetic Acid	28.725 µg/L No EPA limit set worst single sample: 31.3 µg/L	22/47	SYR4	2012–2019
Lead	8.1 µg/L 54% of the EPA limit 15 µg/L worst single sample: 13 µg/L	15/37	SYR4	2012–2019
Copper	1840 µg/L 142% of the EPA limit, at the 95th percentile of samples — 1300 µg/L worst single sample: 1900 µg/L	13/37	SYR4	2012–2019
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	12/12	LCR	2023
Monobromoacetic Acid	1.775 µg/L No EPA limit set worst single sample: 1.8 µg/L	6/47	SYR4	2012–2019
Fluoride	198 µg/L 5% of the EPA limit 4000 µg/L worst single sample: 200 µg/L	3/3	SYR4	2012–2018
Nitrate-Nitrite	96.1 µg/L 1% of the EPA limit 10000 µg/L worst single sample: 100 µg/L	3/8	SYR4	2012–2019
Arsenic	1.395 µg/L 14% of the EPA limit 10 µg/L worst single sample: 1.4 µg/L	2/3	SYR4	2012–2018
Barium	289 µg/L 14% of the EPA limit 2000 µg/L worst single sample: 290 µg/L	2/3	SYR4	2012–2018
Nitrate	61 µg/L 0.6% of the EPA limit 10000 µg/L	2/2	SYR4	2016
Combined Radium (-226 And -228)	1.694 pCi/L 34% of the EPA limit 5 pCi/L	1/1	SYR4	2018
Di(2-ethylhexyl) Phthalate	0.7300 µg/L 12% of the EPA limit 6 µg/L	1/3	SYR4	2012–2018
Gross Beta Particle Activity	3.79 pCi/L No EPA limit set	1/3	SYR4	2012–2018
Selenium	0.5900 µg/L 1.2% of the EPA limit 50 µg/L	1/3	SYR4	2012–2018

59 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, TotalAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateGross Alpha, Excl. Radon And UHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNitriteOxamylPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: NAQUIN, DAVID
Phone: 337-828-4100
Email: [email protected]

Frequently asked questions about Port of West St Mary

Is Port of West St Mary tap water safe to drink?

EPA monitoring detected 23 contaminants in Port of West St Mary'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 Port of West St Mary's water?

EPA monitoring detected Bromodichloromethane, Chloroform, TTHM, Total Haloacetic Acids (HAA5), Dichloroacetic Acid, and others. The full list with the level and data source for each is above.

How many people does Port of West St Mary serve?

Port of West St Mary reports serving 400 people in Louisiana, per its EPA record.

Has Port of West St Mary had any water quality violations?

The EPA has 185 violations on file for Port of West St Mary, of which 144 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.