St Martin Water District 4 - Catahoula, LA
Lead detected, under the action levels
Latest 90th-percentile lead: 1 ppb (monitoring period 2024-2026). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Lead was measured in sampled homes but the 90th percentile is under both action levels. EPA's health goal for lead is zero, so test your own tap if your home was built before 1986 or anyone in it is pregnant or a young child.
Who runs the water here
St Martin Water District 4 - Catahoula serves about 3,000 people through 1,000 service connections, which makes it a small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in St. Martin Parish County, Louisiana. EPA system ID: LA1099004; phone on file: 337-394-6797. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
Against the period ending 2023 (1 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for St Martin Water District 4 - Catahoula is 6 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 1 ppb |
| 2023 | 1 ppb |
| 2020 | 6 ppb |
| 2017 | 1 ppb |
How St Martin Water District 4 - Catahoula compares
Of the 802 Louisiana systems with a lead result, the median latest reading is 0.72 ppb; 4 are over 15 ppb right now and 30 have gone over at some point. St Martin Water District 4 - Catahoula's 1 ppb sits at the 61st percentile in Louisiana and the 54th nationally (higher means more lead).
Neighbouring systems
13 other systems share St. Martin Parish County; 6 of them have a higher latest lead result than St Martin Water District 4 - Catahoula. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Village Of Parks Water System | 12,801 | 0 (not detected) |
| Cecilia Water Corporation | 12,420 | 3 ppb |
| Bayou Teche Water Works | 10,137 | 3 ppb |
| City Of Breaux Bridge Water System | 10,098 | 0 (not detected) |
| City Of St. Martinville Water System | 7,263 | 7 ppb |
| Henderson Nina Water System Inc | 6,010 | 4.6 ppb |
| United Water System | 4,446 | 2 ppb |
| Town Of Arnaudville Water System | 3,957 | 0 (not detected) |
| St Martin Water Works District 3 - Cade | 3,249 | 0 (not detected) |
| St Martin Water And Sewer Commission 1 | 2,262 | 1 ppb |
Your move
Test your own tap with a certified lab first-draw sample; St. Martinville, LA may offer free or low-cost kits through the utility. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask St Martin Water District 4 - Catahoula whether it covers that cost before hiring anyone - many utilities now do.
These figures describe homes the utility sampled, not your tap. Only your service line record or a test of your own water answers the question for your house. Why sampled homes are the worst-case ones is in the guide to reading the number. The action level is dropping - the 10 ppb rule from 2027.