Walnut Municipal Utilities, 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.
About Walnut Municipal Utilities
Walnut Municipal Utilities serves about 768 people through 420 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 Pottawattamie County, Iowa. EPA system ID: IA7872062; phone on file: 712-784-3711. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Walnut Municipal Utilities'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 Walnut Municipal Utilities is 0 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 | 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. Walnut Municipal Utilities's reported as 0 (not detected) sits at the 22nd percentile in Iowa and the 25th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Nearby utilities
14 other systems share Pottawattamie County; 10 of them have a higher latest lead result than Walnut Municipal Utilities. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Council Bluffs Water Works | 64,447 | 2 ppb |
| Carter Lake Water District | 3,791 | 3 ppb |
| Avoca Water Works | 1,697 | 0 (not detected) |
| Urban Bluffs - North | 1,558 | 2 ppb |
| Oakland Munic Water Utility | 1,524 | 1.3 ppb |
| Treynor Water Department | 1,049 | 5 ppb |
| Neola Light & Water | 906 | 4.4 ppb |
| Lakeside Estates Llc | 823 | 0 (not detected) |
| Crescent Water Supply | 778 | 0 (not detected) |
| Carson Water Supply | 766 | 1 ppb |
Next steps for Walnut, IA
Look up your address in Walnut Municipal Utilities'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 Walnut Municipal Utilities 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. Small systems behave differently: why small systems go over more often.