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Tap water quality report

Madisonville on the Lake

EPA monitoring tested this supplier for 82 contaminants and detected 15. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

82
contaminants tested
15
detected
51
people served
33
health-based violations
Louisiana rankingsLead in LouisianaPFAS in Louisiana
Water source
Ground water
Ownership
Private
Counties served
St. Tammany 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.

33
health-based violations
45
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2025-07-15
TT Health-based Resolved 2025-07-15
TT Health-based Resolved 2025-07-15
TT Health-based Resolved 2025-07-15
TT Health-based Resolved 2024-10-17
TT Health-based Resolved 2023-06-11
TT Health-based Resolved 2023-06-11
TT Health-based Resolved 2023-06-11
TT Health-based Resolved 2023-06-11
TT Health-based Resolved 2020-02-08

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
Lead
3 µg/L 20%
of the EPA limit 15 µg/L
 8/16 SYR4 2013–2019
Lead
0.00090 mg/L 6%
of the EPA limit 0.0150 mg/L
 7/7 LCR 2025
Copper
100 µg/L 7.7%
of the EPA limit 1300 µg/L
 5/16 SYR4 2013–2019
Total Haloacetic Acids (HAA5)
1.7 µg/L 2.8%
of the EPA limit 60 µg/L
 4/14 SYR4 2013–2019
Bromodichloromethane
2.8 µg/L
No EPA limit set
 3/14 SYR4 2013–2019
Chloroform
3.2 µg/L
No EPA limit set
 3/14 SYR4 2013–2019
Dibromochloromethane
2 µg/L
No EPA limit set
 3/14 SYR4 2013–2019
Fluoride
100 µg/L 2.5%
of the EPA limit 4000 µg/L
 3/3 SYR4 2013–2019
TTHM
8 µg/L 10%
of the EPA limit 80 µg/L
 3/14 SYR4 2013–2019
Dibromoacetic Acid
0.6100 µg/L
No EPA limit set
 2/14 SYR4 2013–2019
Dichloroacetic Acid
1.2 µg/L
No EPA limit set
 2/14 SYR4 2013–2019
Combined Radium (-226 And -228)
0.6360 pCi/L 13%
of the EPA limit 5 pCi/L
 1/2 SYR4 2016–2019
Di(2-ethylhexyl) Phthalate
0.5100 µg/L 8.5%
of the EPA limit 6 µg/L
 1/3 SYR4 2013–2019
Hexachlorobenzene
0.0950 µg/L 9.5%
of the EPA limit 1 µg/L
 1/3 SYR4 2013–2019
Trichloroacetic Acid
0.5000 µg/L
No EPA limit set
 1/14 SYR4 2013–2019
67 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,3,7,8-TCDD2,4,5-TP2,4-DAntimony, TotalArsenicAsbestosAtrazineBhc-GammaBariumBenzeneBenzo(A)PyreneBeryllium, TotalBromoformChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateGross Alpha, Excl. Radon And UGross Beta Particle ActivityHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNitrate-NitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
LAGRANGE, KEITH
Phone
985-624-3169
Email
klagrange@cityofmandeville.com

Frequently asked questions about Madisonville on the Lake

Is Madisonville on the Lake tap water safe to drink?

EPA monitoring detected 15 contaminants in Madisonville on the Lake'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 Madisonville on the Lake's water?

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

How many people does Madisonville on the Lake serve?

Madisonville on the Lake reports serving 51 people in Louisiana, per its EPA record.

Has Madisonville on the Lake had any water quality violations?

The EPA has 45 violations on file for Madisonville on the Lake, of which 33 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.