Crystal Lake Water Supply, IA
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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. 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
Crystal Lake Water Supply serves about 255 people through 147 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 Hancock County, Iowa. EPA system ID: IA4115092; phone on file: 515-590-1557. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Lead results over time
Against the period ending 2022 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Crystal Lake Water Supply is 10 ppb across 9 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2021 | 0 (not detected) |
| 2020 | 0 (not detected) |
| 2019 | 1 ppb |
| 2019 | 2 ppb |
| 2018 | 2 ppb |
| 2018 | 10 ppb |
| 2017 | 4 ppb |
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. Crystal Lake Water Supply's reported as 0 (not detected) sits at the 14th percentile in Iowa and the 17th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Hancock County
7 other systems share Hancock County; 6 of them have a higher latest lead result than Crystal Lake Water Supply. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Garner Water Works | 3,065 | 2 ppb |
| Britt Water Works | 2,064 | 3 ppb |
| Kanawha Water Supply | 658 | 2.53 ppb |
| Klemme Water Works | 441 | 0 (not detected) |
| Corwith Water Supply | 266 | 2 ppb |
| Woden Water Supply | 188 | 4 ppb |
| Goodell Water Supply | 140 | 3 ppb |
Your move
Look up your address in Crystal Lake 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 Crystal Lake Water Supply whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 1700 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. A zero today does not rule out a jump later - the rules are tightening in 2027.