Sigourney Muni Water Works, IA
Lead detected, under the action levels
Latest 90th-percentile lead: 1.84 ppb (monitoring period 2024-2026). 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
Sigourney Muni Water Works serves about 2,004 people through 1,019 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 Keokuk County, Iowa. EPA system ID: IA5475050; phone on file: 641-622-3080. They can tell you what your service line is made of and whether they pay to replace it.
Every lead result on file
Against the period ending 2023 (1.9 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Sigourney Muni Water Works is 6.9 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 1.84 ppb |
| 2023 | 1.9 ppb |
| 2020 | 1.8 ppb |
| 2017 | 6.9 ppb |
How Sigourney Muni Water Works 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. Sigourney Muni Water Works's 1.84 ppb sits at the 56th percentile in Iowa and the 68th nationally (higher means more lead).
Nearby utilities
9 other systems share Keokuk County; 5 of them have a higher latest lead result than Sigourney Muni Water Works. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Keota Water Dept | 897 | 0 (not detected) |
| Hedrick Water Supply | 728 | 0 (not detected) |
| What Cheer Water Supply | 646 | 2.1 ppb |
| Richland Water Supply | 542 | 2 ppb |
| Delta Water Supply | 264 | 3.4 ppb |
| Keswick Water System | 252 | 6 ppb |
| South English Water Supply | 238 | 1 ppb |
| Harper Water Supply | 118 | 0 (not detected) |
| Webster Municipal Water Works | 96 | 2 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Sigourney, 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 Sigourney Muni Water Works 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.