Westlake Mhp, ID
Lead detected, under the action levels
Latest 90th-percentile lead: 1 ppb (monitoring period 2025-2025). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Lead was measured in sampled homes but the 90th percentile is under both action levels. EPA's health goal for lead is zero, so test your own tap if your home was built before 1986 or anyone in it is pregnant or a young child.
Who runs the water here
Westlake Mhp serves about 116 people through 58 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws surface water, in Mesa County, Idaho. EPA system ID: CO0139839; phone on file: 208-994-9711. They can tell you what your service line is made of and whether they pay to replace it.
Lead results over time
Against the period ending 2025 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Westlake Mhp is 1 ppb across 2 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1 ppb |
| 2025 | 0 (not detected) |
How Westlake Mhp compares
Of the 763 Idaho systems with a lead result, the median latest reading is 1 ppb; 3 are over 15 ppb right now and 46 have gone over at some point. Westlake Mhp's 1 ppb sits at the 45th percentile in Idaho and the 51st nationally (higher means more lead).
Neighbouring systems
5 other systems share Mesa County; 0 of them have a higher latest lead result than Westlake Mhp. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Paradise Park Mhp | 375 | 0 (not detected) |
| Picture Ranch Mhp | 220 | 0 (not detected) |
| Rose Park Mhp | 220 | 1 ppb |
| Garfield Estates Mhp | 178 | 0 (not detected) |
| Vineyards Mhc | 150 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; Boise, ID 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 Westlake Mhp 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. Why sampled homes are the worst-case ones is in the guide to reading the number. Systems that went over once often dip back under; here is what that means.