W Central Rwa - Denison Subsys, 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.
W Central Rwa - Denison Subsys at a glance
W Central Rwa - Denison Subsys serves about 2,428 people through 971 service connections, which makes it a small system under EPA's size classes. It is privately owned and draws groundwater, in Crawford County, Iowa. EPA system ID: IA2424701; phone on file: 712-655-2534. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
Against the period ending 2022 (0.7 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for W Central Rwa - Denison Subsys is 0.7 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2022 | 0.7 ppb |
| 2019 | 0 (not detected) |
| 2016 | 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. W Central Rwa - Denison Subsys'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.
Nearby utilities
9 other systems share Crawford County; 9 of them have a higher latest lead result than W Central Rwa - Denison Subsys. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Denison Water Supply | 9,381 | 1.2 ppb |
| Schleswig Munic Water Supply | 803 | 1 ppb |
| Manilla Muni Service Dept | 758 | 2 ppb |
| Charter Oak Water Supply | 522 | 3 ppb |
| Dow City Water Works | 467 | 1.3 ppb |
| Vail Water Supply | 383 | 1.5 ppb |
| Westside Water Supply | 277 | 3.4 ppb |
| Kiron Water Supply | 257 | 2.2 ppb |
| Deloit Muni Water Supply | 250 | 0.3 ppb |
What to do in your house
Look up your address in W Central Rwa - Denison Subsys'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 W Central Rwa - Denison Subsys 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. The lead result guide covers how utilities pick the homes they sample. Small systems behave differently: why small systems go over more often.