Grand Mound Water Supply, IA
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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. 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.
Who runs the water here
Grand Mound Water Supply serves about 615 people through 243 service connections, which makes it a small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Clinton County, Iowa. EPA system ID: IA2341099; phone on file: 563-847-2190. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Grand Mound Water Supply'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 Grand Mound Water Supply is 10 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 0 (not detected) |
| 2021 | 0 (not detected) |
| 2018 | 10 ppb |
How Grand Mound Water Supply compares
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. Grand Mound Water Supply's reported as 0 (not detected) sits at the 20th percentile in Iowa and the 24th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
15 other systems share Clinton County; 10 of them have a higher latest lead result than Grand Mound Water Supply. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Iowa-American Wtr Co-Clinton District | 24,769 | 2 ppb |
| De Witt Water Supply | 5,514 | 3.4 ppb |
| Camanche Water Supply | 4,570 | 2 ppb |
| Wheatland City Water Supply | 775 | 3.2 ppb |
| Delmar Water Supply | 542 | 2 ppb |
| Lost Nation Water Supply | 434 | 5 ppb |
| Charlotte Water Works | 401 | 0 (not detected) |
| Calamus Water Supply | 356 | 0 (not detected) |
| Iowa-American Water (Low Moor) | 250 | 1.6 ppb |
| Goose Lake Muni Water System | 239 | 0 (not detected) |
Your move
Look up your address in Grand Mound Water Supply'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 Grand Mound Water Supply 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. A zero today does not rule out a jump later - the rules are tightening in 2027.