Sioux Center Municipal Water Department, IA
Lead detected, under the action levels
Latest 90th-percentile lead: 4.4 ppb (monitoring period 2025-2025). 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 Sioux Center Municipal Water Department
Sioux Center Municipal Water Department serves about 8,231 people through 2,832 service connections, which makes it a medium-sized system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Sioux County, Iowa. EPA system ID: IA8486053; phone on file: 712-722-0761. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Sioux Center Municipal Water Department's lead record
Against the period ending 2024 (4.2 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Sioux Center Municipal Water Department is 9.4 ppb across 7 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 4.4 ppb |
| 2024 | 4.2 ppb |
| 2023 | 6.5 ppb |
| 2023 | 2.8 ppb |
| 2022 | 9.4 ppb |
| 2019 | 5 ppb |
| 2016 | 4.8 ppb |
How Sioux Center Municipal Water Department 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. Sioux Center Municipal Water Department's 4.4 ppb sits at the 86th percentile in Iowa and the 89th nationally (higher means more lead).
Neighbouring systems
14 other systems share Sioux County; 1 of them has a higher latest lead result than Sioux Center Municipal Water Department. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Orange City Municipal Water Department | 6,267 | 0 (not detected) |
| Southern Sioux County Rural Water | 5,420 | 2.1 ppb |
| Rock Valley Water Supply | 4,059 | 2 ppb |
| Rural Water System #1 | 3,428 | 1.2 ppb |
| Hawarden Water Supply | 2,700 | 0 (not detected) |
| Hull Water Supply | 2,384 | 1.8 ppb |
| Rock Valley Rural Water District | 2,250 | 2.4 ppb |
| Alton Municipal Water Department | 1,248 | 0.87 ppb |
| Hospers Municipal Water Dept | 718 | 6.1 ppb |
| Boyden Municipal Water Supply | 709 | 2.2 ppb |
Next steps for Sioux Center, IA
Test your own tap with a certified lab first-draw sample; Sioux Center, 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 Sioux Center Municipal Water Department 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. Size matters more than most people expect: small vs large water systems.