St Mary Water & Sewer Comm #3, LA
Lead detected, under the action levels
Latest 90th-percentile lead: 3.3 ppb (monitoring period 2023-2025). 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.
About St Mary Water & Sewer Comm #3
St Mary Water & Sewer Comm #3 serves about 7,828 people through 1,957 service connections, which makes it a medium-sized system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in St. Mary Parish County, Louisiana. EPA system ID: LA1101010; phone on file: 337-836-5609. They can tell you what your service line is made of and whether they pay to replace it.
St Mary Water & Sewer Comm #3's lead record
That is up 3.3 ppb from 0 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for St Mary Water & Sewer Comm #3 is 3.3 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 3.3 ppb |
| 2022 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2016 | 1 ppb |
Against other Louisiana systems
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 Mary Water & Sewer Comm #3's 3.3 ppb sits at the 91st percentile in Louisiana and the 84th nationally (higher means more lead).
Other water systems in St. Mary Parish County
11 other systems share St. Mary Parish County; 1 of them has a higher latest lead result than St Mary Water & Sewer Comm #3. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| City Of Morgan City Water System | 12,703 | 0 (not detected) |
| Water & Sewer Commission 4 Of St Mary | 9,709 | 0 (not detected) |
| City Of Patterson Water System | 8,456 | 0 (not detected) |
| City Of Franklin Water Supply | 8,325 | 2 ppb |
| St Mary Parish W&S #2 Bayou Vista | 5,379 | 0.3 ppb |
| City Of Berwick | 5,024 | 0.7 ppb |
| St Mary Parish Water Sewerage Comm 1 | 2,823 | 0.82 ppb |
| St Mary Par Jt Water Sewer Commission 5 | 1,240 | 2 ppb |
| Port Of West St Mary | 400 | 0 (not detected) |
| Glencoe Community Water System | 190 | 4 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Centerville, 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 Mary Water & Sewer Comm #3 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. The lead result guide covers how utilities pick the homes they sample. Systems that went over once often dip back under; here is what that means.