Carlisle Water Supply, IA
Lead detected, under the action levels
Latest 90th-percentile lead: 1.5 ppb (monitoring period 2021-2023). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Lead was measured in sampled homes but the 90th percentile is under both action levels. EPA's health goal for lead is zero, so test your own tap if your home was built before 1986 or anyone in it is pregnant or a young child.
Who runs the water here
Carlisle Water Supply serves about 4,170 people through 1,850 service connections, which makes it a medium-sized system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Warren County, Iowa. EPA system ID: IA9113071; phone on file: 515-249-2055. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
Against the period ending 2020 (1.1 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Carlisle Water Supply is 1.5 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 1.5 ppb |
| 2020 | 1.1 ppb |
| 2019 | 1.3 ppb |
| 2017 | 1.3 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. Carlisle Water Supply's 1.5 ppb sits at the 52nd percentile in Iowa and the 64th nationally (higher means more lead).
Nearby utilities
12 other systems share Warren County; 2 of them have a higher latest lead result than Carlisle Water Supply. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Indianola Water Supply | 15,833 | 0 (not detected) |
| Norwalk Water Supply | 14,334 | 0 (not detected) |
| Milo Public Water Supply | 788 | 0 (not detected) |
| New Virginia Water Supply | 498 | 1.8 ppb |
| Martensdale Water Supply | 421 | 0 (not detected) |
| Lacona Water Supply | 361 | 2 ppb |
| North American Mobile Home Park | 235 | 0.2 ppb |
| Wilshire Hills Mhc | 216 | 0 (not detected) |
| Hartford Mhc Llc | 183 | 0 (not detected) |
| Indian Ridge Mobile Home Community | 153 | 0.56 ppb |
Next steps for Carlisle, IA
Test your own tap with a certified lab first-draw sample; Carlisle, IA may offer free or low-cost kits through the utility. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Carlisle 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. What a 90th-percentile result does and does not tell you: how to read a lead result. The action level is dropping - the 10 ppb rule from 2027.