Calumet Water Supply, IA
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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. The latest 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
Who runs the water here
Calumet Water Supply serves about 146 people through 94 service connections, which makes it a very small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in O'Brien County, Iowa. EPA system ID: IA7109065; phone on file: 712-446-2490. 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 2023 (1 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Calumet Water Supply is 6.8 ppb across 7 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 0 (not detected) |
| 2023 | 1 ppb |
| 2022 | 6.8 ppb |
| 2021 | 1.2 ppb |
| 2021 | 1.5 ppb |
| 2020 | 1.1 ppb |
| 2017 | 1.6 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. Calumet Water Supply's reported as 0 (not detected) sits at the 8th percentile in Iowa and the 12th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
6 other systems share O'Brien County; 4 of them have a higher latest lead result than Calumet Water Supply. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Sheldon Water Department | 5,512 | 2 ppb |
| Hartley Municipal Water Department | 1,605 | 1.6 ppb |
| Sanborn Water Supply | 1,392 | 0 (not detected) |
| Paullina Municipal Water Supply | 996 | 0 (not detected) |
| Primghar Municipal Water Supply | 902 | 3.3 ppb |
| Sutherland Water Supply | 629 | 1.1 ppb |
Your move
Look up your address in Calumet Water Supply's service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Calumet Water Supply whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 2089 ppb (copper action level 1,300 ppb).
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. Small systems behave differently: why small systems go over more often.