Iowa · population 4,024
Lead pipes in Rock Valley, IA
37 lines still unidentified
Most of Rock Valley (population 4,024) gets its water from Rock Valley Water Supply. It reported no confirmed lead service lines, but 37 of 1,365 lines are still listed as unknown material, so lead hasn't been ruled out.
0% of Rock Valley Water Supply's service lines are lead or galvanized requiring replacement, lower than the Iowa average (5.6%) and lower than the national average (3.1%).
- Lead 0%
- Galvanized (replace) 0%
- Unknown 2.7%
- Non-lead 97%
Latest lead test for Rock Valley Water Supply (Jan 2023–Dec 2025): 2 ppb at the 90th percentile, against a 15 ppb federal action level. Full test history.
Compliance record: EPA lists no Lead and Copper Rule violations since 2015 for Rock Valley Water Supply.
Water systems serving Rock Valley
| Water system | Lead | Galv. | Unknown | % lead |
|---|---|---|---|---|
| Rock Valley Water SupplyMain system | 0 | 0 | 37 | 0% |
| Rock Valley Rural Water DistrictAlso serves parts of the city | 0 | 0 | 0 | 0% |
Matched from EPA water system service area boundaries and the cities each system reports serving. Edges of the city may be served by a neighboring system; your water bill names your utility.
Check your address in Rock Valley
The counts above cover the whole water system. To see whether your line is lead, look up your address on Rock Valley Water Supply's official inventory. Utilities had to make these public by October 16, 2024.
No map yet? Do the 2-minute scratch and magnet test.
Protect your drinking water
If your line is lead, galvanized or unknown, use a filter certified to NSF/ANSI 53 for lead for drinking, cooking and baby formula, and use only cold water.
Choosing a lead-certified filter · Testing your water · Replacement cost
Nearby cities
Check another water system
Questions
Does Rock Valley, IA have lead pipes?
None are confirmed, but Rock Valley Water Supply still lists 37 service lines as unknown material.
Who supplies water to Rock Valley?
EPA's service area maps place most of Rock Valley in Rock Valley Water Supply's service area (PWSID IA8482096). Rock Valley Rural Water District also serves parts of the city or nearby areas.
How do I check whether my Rock Valley home has a lead service line?
Search your address on Rock Valley Water Supply's service line inventory map. You can also scratch the pipe where water enters your home: lead is soft, dull gray, scratches to shiny silver and doesn't attract a magnet.
When will lead pipes in Rock Valley be replaced?
EPA's Lead and Copper Rule Improvements require most systems to replace lead and galvanized-requiring-replacement lines by December 31, 2037. Ask Rock Valley Water Supply whether your street is scheduled and whether it covers the private side.