Missouri Valley Water Supply, IA
Lead detected, under the action levels
Latest 90th-percentile lead: 2.9 ppb (monitoring period 2023-2025). 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.
Who runs the water here
Missouri Valley Water Supply serves about 2,678 people through 1,260 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 Harrison County, Iowa. EPA system ID: IA4344088; phone on file: 402-669-8373. They can tell you what your service line is made of and whether they pay to replace it.
Lead results over time
Against the period ending 2021 (3.5 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Missouri Valley Water Supply is 4.1 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 2.9 ppb |
| 2021 | 3.5 ppb |
| 2018 | 4.1 ppb |
Where this result ranks
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. Missouri Valley Water Supply's 2.9 ppb sits at the 73rd percentile in Iowa and the 80th nationally (higher means more lead).
Other water systems in Harrison County
10 other systems share Harrison County; 6 of them have a higher latest lead result than Missouri Valley Water Supply. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Woodbine Water Department | 1,625 | 4 ppb |
| Logan Water Supply | 1,397 | 2 ppb |
| Dunlap Water Supply | 1,035 | 3 ppb |
| Mondamin Water Supply | 339 | 2.57 ppb |
| Modale Water Supply | 280 | 3 ppb |
| Pisgah Water Supply | 245 | 3.2 ppb |
| Sunnyside Village Mhp Llc | 190 | 0 (not detected) |
| Magnolia, City Of | 188 | 0 (not detected) |
| Little Sioux Water Department | 150 | 3 ppb |
| Valley View Water Association | 65 | 3.8 ppb |
Next steps for Missouri Valley, IA
Test your own tap with a certified lab first-draw sample; Missouri Valley, 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 Missouri Valley 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. Why sampled homes are the worst-case ones is in the guide to reading the number. Systems that went over once often dip back under; here is what that means.