City Of Bay St Louis, MS
Lead detected, under the action levels
Latest 90th-percentile lead: 9 ppb (monitoring period 2022-2024). 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.
City Of Bay St Louis at a glance
City Of Bay St Louis serves about 9,284 people through 3,847 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 groundwater, in Hancock County, Mississippi. EPA system ID: MS0230001; phone on file: 228-467-5505. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
That is up 7.5 ppb from 1.5 ppb in the period ending 2021. The highest 90th-percentile result EPA holds for City Of Bay St Louis is 9 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 9 ppb |
| 2021 | 1.5 ppb |
| 2018 | 4.3 ppb |
| 2016 | 1.6 ppb |
Where this result ranks
Of the 973 Mississippi systems with a lead result, the median latest reading is 1 ppb; 9 are over 15 ppb right now and 44 have gone over at some point. City Of Bay St Louis's 9 ppb sits at the 98th percentile in Mississippi and the 97th nationally (higher means more lead).
Other water systems in Hancock County
11 other systems share Hancock County; 0 of them have a higher latest lead result than City Of Bay St Louis. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Diamondhead Utilities-North | 12,577 | 1.2 ppb |
| Kiln Utility And Fire District Of Hancoc | 7,051 | 1.1 ppb |
| City Of Waveland | 6,400 | 7.9 ppb |
| Standard Dedeaux Water Association | 5,386 | 0.8 ppb |
| Stennis Space Center | 4,700 | 5 ppb |
| Hancock County Water & Sewer | 3,254 | 6.3 ppb |
| Hancock County Water & Sewer- Bayside | 2,458 | - |
| Pearlington Water And Sewer District | 1,412 | 1.4 ppb |
| Sunrise Mobile Home Park | 25 | 1.6 ppb |
| Hancock County Utility Authority | - | - |
What to do in your house
Test your own tap with a certified lab first-draw sample; Bay St Louis, MS 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 Bay St Louis 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.