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Tap water quality report

St Mary Water & Sewer Comm #3

EPA monitoring tested this supplier for 112 contaminants and detected 28. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

112
contaminants tested
28
detected
7,828
people served
24
health-based violations
Louisiana rankingsLead in LouisianaPFAS in Louisiana
Water source
Surface 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.

24
health-based violations
36
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2025-01-01 → 2025-03-31
MCL Health-based Resolved 2025-01-01 → 2025-03-31
MCL Health-based Resolved 2025-01-01 → 2025-03-31
MCL Health-based Resolved 2025-01-01 → 2025-03-31
MCL Health-based Resolved 2017-07-01 → 2017-09-30
MCL Health-based Resolved 2017-07-01 → 2017-09-30
MCL Health-based Resolved 2017-07-01 → 2017-09-30
MCL Health-based Resolved 2017-07-01 → 2017-09-30
MCL Health-based Resolved 2017-07-01 → 2017-09-30
MCL Health-based Resolved 2017-07-01 → 2017-09-30

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
Pfba 0.0054 µg/L 2/4 2024

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
22.8 µg/L
No EPA limit set
 61/61 SYR4 2012–2019
Chloroform
85.5 µg/L
No EPA limit set
 61/61 SYR4 2012–2019
TTHM
110 µg/L 138%
of the EPA limit, in the worst sample — 80 µg/L
 58/58 SYR4 2012–2019
Copper
1300 µg/L 100%
of the EPA limit 1300 µg/L
 57/65 SYR4 2013–2019
Total Haloacetic Acids (HAA5)
87.4 µg/L 146%
of the EPA limit, in the worst sample — 60 µg/L
 57/58 SYR4 2012–2019
Dichloroacetic Acid
49 µg/L
No EPA limit set
 56/58 SYR4 2012–2019
Trichloroacetic Acid
38.8 µg/L
No EPA limit set
 56/58 SYR4 2012–2019
Dibromoacetic Acid
3.8 µg/L
No EPA limit set
 49/58 SYR4 2012–2019
Dibromochloromethane
6 µg/L
No EPA limit set
 49/61 SYR4 2012–2019
Monochloroacetic Acid
4.9 µg/L
No EPA limit set
 30/58 SYR4 2012–2019
Lead
87 µg/L 580%
of the EPA limit, in the worst sample — 15 µg/L
 20/65 SYR4 2013–2019
Nitrate-Nitrite
1000 µg/L 10%
of the EPA limit 10000 µg/L
 12/16 SYR4 2012–2019
Lead
0.0033 mg/L 22%
of the EPA limit 0.0150 mg/L
 11/11 LCR 2025
Monobromoacetic Acid
4.3 µg/L
No EPA limit set
 9/58 SYR4 2012–2019
Fluoride
110 µg/L 2.8%
of the EPA limit 4000 µg/L
 7/8 SYR4 2012–2019
Barium
57 µg/L 2.9%
of the EPA limit 2000 µg/L
 5/8 SYR4 2012–2019
Dalapon
38.27 µg/L 19%
of the EPA limit 200 µg/L
 5/13 SYR4 2012–2019
Atrazine
0.5100 µg/L 17%
of the EPA limit 3 µg/L
 4/16 SYR4 2012–2019
Di(2-ethylhexyl) Phthalate
1.25 µg/L 21%
of the EPA limit 6 µg/L
 4/16 SYR4 2012–2019
Gross Beta Particle Activity
3.09 pCi/L
No EPA limit set
 3/7 SYR4 2012–2019
Combined Radium (-226 And -228)
0.7640 pCi/L 15%
of the EPA limit 5 pCi/L
 2/5 SYR4 2015–2019
Arsenic
2.6 µg/L 26%
of the EPA limit 10 µg/L
 1/8 SYR4 2012–2019
Cyanide
5.4 µg/L 2.7%
of the EPA limit 200 µg/L
 1/8 SYR4 2012–2019
Hexachlorocyclopentadiene
0.1600 µg/L 0.3%
of the EPA limit 50 µg/L
 1/16 SYR4 2012–2019
Selenium
0.6200 µg/L 1.2%
of the EPA limit 50 µg/L
 1/8 SYR4 2012–2019
Xylenes, Total
0.7600 µg/L 0%
of the EPA limit 10000 µg/L
 1/8 SYR4 2012–2019
Lithium
11 µg/L
No EPA limit set
 1/4 UCMR-5 2024
84 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined UraniumDichloromethaneDi(2-ethylhexyl) AdipateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateGross Alpha, Excl. Radon And UHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaOxamylPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
SOPRANO, BECKY
Phone
337-836-5609
Email
bsoprano@stmaryparishla.gov

Frequently asked questions about St Mary Water & Sewer Comm #3

Is St Mary Water & Sewer Comm #3 tap water safe to drink?

EPA monitoring detected 28 contaminants in St Mary Water & Sewer Comm #3'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 St Mary Water & Sewer Comm #3's water?

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

How many people does St Mary Water & Sewer Comm #3 serve?

St Mary Water & Sewer Comm #3 reports serving 7,828 people in Louisiana, per its EPA record.

Has St Mary Water & Sewer Comm #3 had any water quality violations?

The EPA has 36 violations on file for St Mary Water & Sewer Comm #3, of which 24 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.