Holy Cross Water Supply, IA
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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. 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.
Holy Cross Water Supply at a glance
Holy Cross Water Supply serves about 356 people through 173 service connections, which makes it a very 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: IA3146055; phone on file: 563-870-2475. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
Against the period ending 2020 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Holy Cross Water Supply is 0 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 0 (not detected) |
| 2020 | 0 (not detected) |
| 2017 | 0 (not detected) |
How Holy Cross 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. Holy Cross Water Supply's reported as 0 (not detected) sits at the 16th percentile in Iowa and the 20th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
29 other systems share Dubuque County; 18 of them have a higher latest lead result than Holy Cross 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 |
| Cascade Municipal Water Supply | 2,386 | 0 (not detected) |
| 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) |
Your move
Look up your address in Holy Cross 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 Holy Cross 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. The lead result guide covers how utilities pick the homes they sample. Small systems behave differently: why small systems go over more often.