Cascade Municipal 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.
Cascade Municipal Water Supply at a glance
Cascade Municipal Water Supply serves about 2,386 people through 1,055 service connections, which makes it a small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Dubuque County, Iowa. EPA system ID: IA3118080; phone on file: 563-852-3114. 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 2022 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Cascade Municipal Water Supply is 0 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2016 | 0 (not detected) |
How Cascade Municipal Water Supply compares
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. Cascade Municipal Water Supply's reported as 0 (not detected) sits at the 27th 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
29 other systems share Dubuque County; 18 of them have a higher latest lead result than Cascade Municipal Water Supply. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Dubuque Water Works | 59,667 | 5 ppb |
| Asbury Municipal Water System | 5,943 | 0 (not detected) |
| Dyersville Municipal Water Co | 4,477 | 1.7 ppb |
| Peosta Water Supply | 2,278 | 0.5 ppb |
| Epworth Water Supply | 2,023 | 5.75 ppb |
| Farley Water Supply | 1,766 | 1.3 ppb |
| Alpine Park | 932 | 4.6 ppb |
| Table Mound Park | 455 | 0 (not detected) |
| New Vienna Water Supply | 382 | 0 (not detected) |
| Worthington Water Supply | 382 | 0 (not detected) |
Next steps for Cascade, IA
Look up your address in Cascade Municipal 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 Cascade Municipal 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. Small systems behave differently: why small systems go over more often.