West Central Rwa - Nish System, IA
Lead detected, under the action levels
Latest 90th-percentile lead: 1.7 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
West Central Rwa - Nish System serves about 3,573 people through 1,429 service connections, which makes it a medium-sized system under EPA's size classes. It is privately owned and draws groundwater, in Carroll County, Iowa. EPA system ID: IA1400902; phone on file: 712-655-2534. They can tell you what your service line is made of and whether they pay to replace it.
West Central Rwa - Nish System's lead record
That is up 1.7 ppb from 0 ppb in the period ending 2020. The highest 90th-percentile result EPA holds for West Central Rwa - Nish System is 1.7 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 1.7 ppb |
| 2020 | 0 (not detected) |
| 2017 | 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. West Central Rwa - Nish System's 1.7 ppb sits at the 55th percentile in Iowa and the 66th nationally (higher means more lead).
Other water systems in Carroll County
12 other systems share Carroll County; 6 of them have a higher latest lead result than West Central Rwa - Nish System. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Carroll Municipal Water Supply | 10,321 | 8 ppb |
| Manning Water Supply | 1,392 | 2 ppb |
| Coon Rapids Municipal Utilities | 1,242 | 0 (not detected) |
| Glidden Water Supply | 1,140 | 2.1 ppb |
| Arcadia Water Supply | 525 | 8.4 ppb |
| Breda Water Supply | 502 | 0 (not detected) |
| Templeton Water Supply | 352 | 2.8 ppb |
| Halbur Water Supply | 249 | 4 ppb |
| Dedham Water Supply | 221 | 1 ppb |
| Lidderdale Water Supply | 166 | 0.6 ppb |
Next steps for Manning, IA
Test your own tap with a certified lab first-draw sample; Manning, 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 West Central Rwa - Nish System 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. Size matters more than most people expect: small vs large water systems.