Hancock Water Supply, IA
Lead detected, under the action levels
Latest 90th-percentile lead: 0.5 ppb (monitoring period 2021-2023). 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.
Hancock Water Supply at a glance
Hancock Water Supply serves about 200 people through 114 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 groundwater, in Pottawattamie County, Iowa. EPA system ID: IA7833025; phone on file: 712-741-5665. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
Against the period ending 2020 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Hancock Water Supply is 0.5 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 0.5 ppb |
| 2020 | 0 (not detected) |
| 2017 | 0 (not detected) |
How Hancock 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. Hancock Water Supply's 0.5 ppb sits at the 33rd percentile in Iowa and the 43rd nationally (higher means more lead).
Nearby utilities
14 other systems share Pottawattamie County; 9 of them have a higher latest lead result than Hancock Water Supply. 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) |
| Walnut Municipal Utilities | 768 | 0 (not detected) |
Next steps for Hancock, IA
Test your own tap with a certified lab first-draw sample; Hancock, IA 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 Hancock 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. What a 90th-percentile result does and does not tell you: how to read a lead result. The action level is dropping - the 10 ppb rule from 2027.