Is Madisonville, LA tap water safe?
The short answer
1 of the 3 utilities serving Madisonville has a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and CDC’s records: Marina del Ray Water System.
St Tam Parish - Bedico - Faubourg - Coquille, which serves the most people here, has 1 result above the health goal and 1 result above EPA’s health benchmark. The worst: Lithium at 16.7 ppb, above EPA’s health benchmark. Health goals are stricter than legal limits and are not enforced.
A town can be served by more than one utility, and some homes are on private wells. The name on your water bill tells you which is yours, and your ZIP code narrows it down. They are listed by how many people each serves in Madisonville’s ZIP codes, from EPA’s estimates.
- Open report
St Tam Parish - Bedico - Faubourg - Coquille
Louisiana · serves 18,372 people · about 470 in Madisonville
1 result above the health goal and 1 result above EPA’s health benchmark. The worst: Lithium at 16.7 ppb, above EPA’s health benchmark.
No health-based violations since 2016
- Open report
Village of Madisonville Water Supply
Louisiana · serves 871 people · under 100 in Madisonville
Nothing in its records is above a health goal.
No health-based violations since 2016
- Open report
Marina del Ray Water System
Louisiana · serves 500 people · based in Madisonville
2 results above the health goal. The worst: Arsenic at 1.0 ppb, above the health goal.
1 health-based violation since 2016
What handles it
Each of these is certified, on a certifier’s listing, for a result above a line in St Tam Parish - Bedico - Faubourg - Coquille’s water, which serves the most people here. Another utility’s report names what handles its own results.
Disclosure: TapBuff earns a commission if you buy through some links on this page. It does not change which standard or filter we name. As an Amazon Associate, TapBuff earns from qualifying purchases. How TapBuff makes money
Countertop reverse osmosis
- IAPMO listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 4, 2026
Certified for: Arsenic
Aquasana SmartFlow Reverse Osmosis (AQ-SFRO2)
Under-sink reverse osmosis
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 9, 2026
Certified for: Arsenic
Brondell Capella RC250 Reverse Osmosis System
Under-sink reverse osmosis
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 9, 2026
Certified for: Arsenic
Water testing near Madisonville
The 3 labs Louisiana certifies closest to Madisonville, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Water Test, Inc.
Covington, LA · about 5 miles
Certified for bacteria
Curtis Environmental Services, Inc.
LaPlace, LA · about 23 miles
Certified for minerals and other inorganics, disinfection byproducts
LDH Amite Regional Laboratory
Amite, LA · about 27 miles
Certified for bacteria
ZIP codes in Madisonville
Which ZIP codes are in Madisonville: Census 2020 relationship files. Which utilities serve them, and how many people: EPA SDWIS and EPA’s service area map. Each utility’s results: EPA UCMR 5, EPA SDWIS, and EPA’s and the state’s compliance monitoring, as its report lists them. How they are measured: methodology. Certified labs: LDH, laboratories certified by Louisiana for drinking water analysis; distances from the Census 2020 ZIP code tabulation area gazetteer.
Near Madisonville
Other towns in St. Tammany Parish with a page of their own.
What to do next
- Read St Tam Parish - Bedico - Faubourg - Coquille’s full reportEvery result with its dates, the violations, and the certification claim that handles each finding.Open the report
- About LithiumWhat it does to health, where it comes from, and the certification claim that addresses it.About Lithium
- On a private well?No utility tests a well. A certified lab test is the first step.How to test well water