Sirwa - Corning, 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.
About Sirwa - Corning
Sirwa - Corning serves about 2,585 people through 1,034 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 surface water, in Adams County, Iowa. EPA system ID: IA0207704; phone on file: 641-782-5744. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Lead results over time
That is down 2 ppb from 2 ppb in the period ending 2021. The highest 90th-percentile result EPA holds for Sirwa - Corning is 4 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 0 (not detected) |
| 2021 | 2 ppb |
| 2018 | 4 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. Sirwa - Corning's reported as 0 (not detected) sits at the 28th percentile in Iowa and the 32nd nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
1 other system shares Adams County; 1 of them has a higher latest lead result than Sirwa - Corning. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Corning Muni Water Department | 1,735 | 2.5 ppb |
Your move
Look up your address in Sirwa - Corning'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 Sirwa - Corning 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. Small systems behave differently: why small systems go over more often.