Carson Water Supply, IA
Lead detected, under the action levels
Latest 90th-percentile lead: 1 ppb (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. 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.
About Carson Water Supply
Carson Water Supply serves about 766 people through 358 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: IA7809078; phone on file: 402-253-5227. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Carson Water Supply's lead record
Against the period ending 2021 (2 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Carson Water Supply is 4 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 1 ppb |
| 2021 | 2 ppb |
| 2018 | 4 ppb |
How Carson 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. Carson Water Supply's 1 ppb sits at the 42nd percentile in Iowa and the 53rd nationally (higher means more lead).
Neighbouring systems
14 other systems share Pottawattamie County; 8 of them have a higher latest lead result than Carson 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 Carson, IA
Test your own tap with a certified lab first-draw sample; Carson, 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 Carson 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. Systems that went over once often dip back under; here is what that means.