Saint Marys Water Corporation, IA
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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. The latest 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
Saint Marys Water Corporation at a glance
Saint Marys Water Corporation serves about 121 people through 69 service connections, which makes it a very small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Warren County, Iowa. EPA system ID: IA9176019; phone on file: 515-664-1442. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Saint Marys Water Corporation's lead record
Against the period ending 2022 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Saint Marys Water Corporation is 0 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2016 | 0 (not detected) |
Against other Iowa systems
Of the 1,066 Iowa systems with a lead result, the median latest reading is 1.4 ppb; 4 are over 15 ppb right now and 36 have gone over at some point. Saint Marys Water Corporation's reported as 0 (not detected) sits at the 7th percentile in Iowa and the 11th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Nearby utilities
12 other systems share Warren County; 5 of them have a higher latest lead result than Saint Marys Water Corporation. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Indianola Water Supply | 15,833 | 0 (not detected) |
| Norwalk Water Supply | 14,334 | 0 (not detected) |
| Carlisle Water Supply | 4,170 | 1.5 ppb |
| Milo Public Water Supply | 788 | 0 (not detected) |
| New Virginia Water Supply | 498 | 1.8 ppb |
| Martensdale Water Supply | 421 | 0 (not detected) |
| Lacona Water Supply | 361 | 2 ppb |
| North American Mobile Home Park | 235 | 0.2 ppb |
| Wilshire Hills Mhc | 216 | 0 (not detected) |
| Hartford Mhc Llc | 183 | 0 (not detected) |
What to do in your house
Look up your address in Saint Marys Water Corporation's service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Saint Marys Water Corporation 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. Small systems behave differently: why small systems go over more often.