Calamus Water Supply, IA
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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. 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
Calamus Water Supply serves about 356 people through 185 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 Clinton County, Iowa. EPA system ID: IA2320062; phone on file: 563-246-2755. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Calamus Water Supply's lead record
That is down 1.6 ppb from 1.6 ppb in the period ending 2021. The highest 90th-percentile result EPA holds for Calamus Water Supply is 1.6 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 0 (not detected) |
| 2021 | 1.6 ppb |
| 2018 | 0 (not detected) |
Against other Iowa systems
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. Calamus Water Supply's reported as 0 (not detected) sits at the 16th percentile in Iowa and the 20th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Nearby utilities
15 other systems share Clinton County; 10 of them have a higher latest lead result than Calamus Water Supply. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Iowa-American Wtr Co-Clinton District | 24,769 | 2 ppb |
| De Witt Water Supply | 5,514 | 3.4 ppb |
| Camanche Water Supply | 4,570 | 2 ppb |
| Wheatland City Water Supply | 775 | 3.2 ppb |
| Grand Mound Water Supply | 615 | 0 (not detected) |
| Delmar Water Supply | 542 | 2 ppb |
| Lost Nation Water Supply | 434 | 5 ppb |
| Charlotte Water Works | 401 | 0 (not detected) |
| Iowa-American Water (Low Moor) | 250 | 1.6 ppb |
| Goose Lake Muni Water System | 239 | 0 (not detected) |
What to do in your house
Look up your address in Calamus 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 Calamus 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. A zero today does not rule out a jump later - the rules are tightening in 2027.