Gilbert Water Supply, IA
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2024-2024). 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
Gilbert Water Supply serves about 1,211 people through 512 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 Story County, Iowa. EPA system ID: IA8531083; phone on file: 515-766-0020. They can tell you what your service line is made of and whether they pay to replace it.
Lead results over time
That is down 5 ppb from 5 ppb in the period ending 2023. The highest 90th-percentile result EPA holds for Gilbert Water Supply is 5 ppb across 5 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 0 (not detected) |
| 2023 | 5 ppb |
| 2022 | 0 (not detected) |
| 2021 | 0 (not detected) |
| 2018 | 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. Gilbert Water Supply's reported as 0 (not detected) sits at the 24th percentile in Iowa and the 28th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
18 other systems share Story County; 11 of them have a higher latest lead result than Gilbert Water Supply. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Ames Water Treatment Plant | 55,177 | 0 (not detected) |
| Isu | 42,000 | 1.2 ppb |
| Nevada Water Supply | 6,925 | 0 (not detected) |
| Huxley Waterworks Dept | 4,244 | 1.1 ppb |
| Story City Water Dept | 3,357 | 0 (not detected) |
| Slater Muni Water Dept | 1,548 | 7 ppb |
| Roland Water Supply | 1,394 | 0 (not detected) |
| Maxwell Water Department | 859 | 4 ppb |
| Colo Water Supply | 853 | 1.1 ppb |
| Cambridge Water Supply | 832 | 2 ppb |
Next steps for Gilbert, IA
Look up your address in Gilbert 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 Gilbert 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. The lead result guide covers how utilities pick the homes they sample. Small systems behave differently: why small systems go over more often.