Tap WaterIndex

← Louisiana

Tap water quality report

Port of West St Mary

EPA monitoring tested this supplier for 82 contaminants and detected 23. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

82
contaminants tested
23
detected
400
people served
144
health-based violations
Louisiana rankingsLead in LouisianaPFAS in Louisiana
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
1
still open
ViolationTypeStatusPeriod
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 single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Bromodichloromethane
59 µg/L
No EPA limit set
 47/47 SYR4 2012–2019
Chloroform
81 µg/L
No EPA limit set
 47/47 SYR4 2012–2019
TTHM
175.6 µg/L 219%
of the EPA limit, in the worst sample — 80 µg/L
 47/47 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
71 µg/L 118%
of the EPA limit, in the worst sample — 60 µg/L
 45/47 SYR4 2012–2019
Dichloroacetic Acid
27.8 µg/L
No EPA limit set
 44/47 SYR4 2012–2019
Dibromoacetic Acid
13 µg/L
No EPA limit set
 43/47 SYR4 2012–2019
Dibromochloromethane
38.7 µg/L
No EPA limit set
 43/47 SYR4 2012–2019
Bromoform
6.8 µg/L
No EPA limit set
 42/47 SYR4 2012–2019
Trichloroacetic Acid
30.7 µg/L
No EPA limit set
 41/47 SYR4 2012–2019
Monochloroacetic Acid
31.3 µg/L
No EPA limit set
 22/47 SYR4 2012–2019
Lead
13 µg/L 87%
of the EPA limit 15 µg/L
 15/37 SYR4 2012–2019
Copper
1900 µg/L 146%
of the EPA limit, in the worst sample — 1300 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
1.8 µg/L
No EPA limit set
 6/47 SYR4 2012–2019
Fluoride
200 µg/L 5%
of the EPA limit 4000 µg/L
 3/3 SYR4 2012–2018
Nitrate-Nitrite
100 µg/L 1%
of the EPA limit 10000 µg/L
 3/8 SYR4 2012–2019
Arsenic
1.4 µg/L 14%
of the EPA limit 10 µg/L
 2/3 SYR4 2012–2018
Barium
290 µg/L 14%
of the EPA limit 2000 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
dnaquin@portofwsm.com

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.