Magnolia-Monterey Subdivision, LA
Lead detected, under the action levels
Latest 90th-percentile lead: 1 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.
Who runs the water here
Magnolia-Monterey Subdivision serves about 1,356 people through 452 service connections, which makes it a small system under EPA's size classes. It is privately owned and draws groundwater, in St. Tammany Parish County, Louisiana. EPA system ID: LA1103148; phone on file: 985-377-0016. They can tell you what your service line is made of and whether they pay to replace it.
Magnolia-Monterey Subdivision's lead record
Against the period ending 2021 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Magnolia-Monterey Subdivision is 1 ppb across 5 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 1 ppb |
| 2021 | 0 (not detected) |
| 2021 | 0 (not detected) |
| 2018 | 0 (not detected) |
| 2018 | 0 (not detected) |
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. Magnolia-Monterey Subdivision's 1 ppb sits at the 59th percentile in Louisiana and the 54th nationally (higher means more lead).
Other water systems in St. Tammany Parish County
65 other systems share St. Tammany Parish County; 14 of them have a higher latest lead result than Magnolia-Monterey Subdivision. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| City Of Slidell Water Supply | 35,547 | 0 (not detected) |
| St Tam Parish- Bedico -Faubourg-Coquille | 18,372 | 0 (not detected) |
| St Tam Parish - Briarwood Terrace | 17,536 | 2 ppb |
| City Of Covington Water Supply | 16,185 | 0 (not detected) |
| City Of Mandeville Water Supply | 13,000 | 1 ppb |
| Utilities Inc - North Park Water Supply | 11,298 | 0 (not detected) |
| Bayou Liberty Water Association | 10,791 | 0 (not detected) |
| St Tam Parish - Cross Gates Sd | 8,037 | 0 (not detected) |
| Lee Road Water Corporation | 7,665 | 2 ppb |
| Utilities Inc - Kingspoint Subdivision | 6,351 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; Mandeville, 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 Magnolia-Monterey Subdivision 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. Systems that went over once often dip back under; here is what that means.