Twin Lakes Utilities, IA
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2024-2024). 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.
Twin Lakes Utilities at a glance
Twin Lakes Utilities serves about 300 people through 400 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Calhoun County, Iowa. EPA system ID: IA1300101; phone on file: 712-297-8616. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Twin Lakes Utilities's lead record
Against the period ending 2023 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Twin Lakes Utilities is 2 ppb across 5 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 0 (not detected) |
| 2023 | 0 (not detected) |
| 2022 | 0.3 ppb |
| 2021 | 0.4 ppb |
| 2018 | 2 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. Twin Lakes Utilities's reported as 0 (not detected) sits at the 14th percentile in Iowa and the 18th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Nearby utilities
11 other systems share Calhoun County; 11 of them have a higher latest lead result than Twin Lakes Utilities. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Rockwell City Water Supply | 2,250 | 2 ppb |
| Lake City Water Supply | 1,731 | 4 ppb |
| Manson Water Supply | 1,727 | 6 ppb |
| Pomeroy Water Supply | 671 | 2.1 ppb |
| Lohrville Water Supply | 381 | 1.1 ppb |
| Farnhamville Water Supply | 379 | 3 ppb |
| Lytton Water Department | 282 | 3 ppb |
| Somers Water Works | 128 | 11 ppb |
| Knierim Water Supply | 53 | 2 ppb |
| Rinard Water Supply | 38 | 4 ppb |
Your move
Look up your address in Twin Lakes Utilities'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 Twin Lakes Utilities 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. A zero today does not rule out a jump later - the rules are tightening in 2027.