Wall Lake Water Supply, IA
Lead detected, under the action levels
Latest 90th-percentile lead: 2.3 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.
Who runs the water here
Wall Lake Water Supply serves about 780 people through 465 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 Sac County, Iowa. EPA system ID: IA8166061; phone on file: 712-664-2216. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
That is down 1.7 ppb from 4 ppb in the period ending 2021. The highest 90th-percentile result EPA holds for Wall Lake Water Supply is 4 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 2.3 ppb |
| 2021 | 4 ppb |
| 2018 | 0 (not detected) |
How Wall Lake 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. Wall Lake Water Supply's 2.3 ppb sits at the 70th percentile in Iowa and the 76th nationally (higher means more lead).
Other water systems in Sac County
7 other systems share Sac County; 3 of them have a higher latest lead result than Wall Lake Water Supply. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Sac City Municipal Water Plant | 2,093 | 0 (not detected) |
| West Central Rwa-Boyer System | 1,715 | 1.7 ppb |
| Lake View Water Supply | 1,133 | 4.6 ppb |
| Odebolt Water Supply | 994 | 4.8 ppb |
| Schaller Water Supply | 729 | 0.7 ppb |
| Early Municipal Water Supply | 587 | 1.8 ppb |
| Auburn Water Supply | 265 | 2.4 ppb |
Next steps for Wall Lake, IA
Test your own tap with a certified lab first-draw sample; Wall Lake, 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 Wall Lake 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. The action level is dropping - the 10 ppb rule from 2027.