City Of Berwick, LA
Lead detected, under the action levels
Latest 90th-percentile lead: 0.7 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.
Who runs the water here
City Of Berwick serves about 5,024 people through 1,974 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: LA1101014; phone on file: 985-384-8858. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
Against the period ending 2022 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for City Of Berwick is 1 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0.7 ppb |
| 2022 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2016 | 1 ppb |
Where this result ranks
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. City Of Berwick's 0.7 ppb sits at the 50th percentile in Louisiana and the 47th nationally (higher means more lead).
Other water systems in St. Mary Parish County
11 other systems share St. Mary Parish County; 5 of them have a higher latest lead result than City Of Berwick. 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 Water & Sewer Comm #3 | 7,828 | 3.3 ppb |
| St Mary Parish W&S #2 Bayou Vista | 5,379 | 0.3 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 |
What to do in your house
Test your own tap with a certified lab first-draw sample; Berwick, 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 City Of Berwick 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. What a 90th-percentile result does and does not tell you: how to read a lead result. Size matters more than most people expect: small vs large water systems.