Lost Canyon Mhp (Peosta), IA
Above the new 10 ppb level coming in 2027
Latest 90th-percentile lead: 12.4 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. Under the current 15 ppb rule this is not an exceedance, but it is above the 10 ppb action level that takes over in Nov 2027. Test your own tap; filter if your result shows lead.
Who runs the water here
Lost Canyon Mhp (Peosta) serves about 97 people through 62 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Dubuque County, Iowa. EPA system ID: IA3100608; phone on file: 563-599-9538. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Every lead result on file
That is up 6.6 ppb from 5.8 ppb in the period ending 2020. The highest 90th-percentile result EPA holds for Lost Canyon Mhp (Peosta) is 12.4 ppb across 3 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 12.4 ppb over 10 |
| 2020 | 5.8 ppb |
| 2017 | 0 (not detected) |
How Lost Canyon Mhp (Peosta) 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. Lost Canyon Mhp (Peosta)'s 12.4 ppb sits at the 99th percentile in Iowa and the 98th nationally (higher means more lead).
Other water systems in Dubuque County
29 other systems share Dubuque County; 0 of them have a higher latest lead result than Lost Canyon Mhp (Peosta). 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) |
Next steps for Peosta, IA
Test your own tap with a certified lab first-draw sample; Peosta, 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 Lost Canyon Mhp (Peosta) 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. This system is in the band the 2027 10 ppb rule changes.