Cobblestone Mhp, OR
Lead detected, under the action levels
Latest 90th-percentile lead: 1.5 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.
About Cobblestone Mhp
Cobblestone Mhp serves about 100 people through 69 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws surface water, in Jackson County, Oregon. EPA system ID: OR4100517; phone on file: 541-227-9744. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Lead results over time
Against the period ending 2024 (0.55 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Cobblestone Mhp is 12.8 ppb across 9 monitoring periods, none of them over 15 ppb (2 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1.5 ppb |
| 2024 | 0.55 ppb |
| 2024 | 1.02 ppb |
| 2023 | 12.8 ppb over 10 |
| 2023 | 1.31 ppb |
| 2022 | 6.9 ppb |
| 2020 | 4.52 ppb |
| 2017 | 5.28 ppb |
| 2016 | 10.7 ppb over 10 |
Where this result ranks
Of the 909 Oregon systems with a lead result, the median latest reading is 1 ppb; 15 are over 15 ppb right now and 71 have gone over at some point. Cobblestone Mhp's 1.5 ppb sits at the 60th percentile in Oregon and the 63rd nationally (higher means more lead).
Neighbouring systems
63 other systems share Jackson County; 22 of them have a higher latest lead result than Cobblestone Mhp. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Medford Water Commission | 106,068 | 0 (not detected) |
| Ashland Water Department | 20,946 | 3.44 ppb |
| Central Point, City Of | 19,785 | 0.67 ppb |
| Eagle Point, City Of | 9,554 | 1.32 ppb |
| Talent, City Of | 6,293 | 0.55 ppb |
| Phoenix, City Of | 5,900 | 0.23 ppb |
| Jacksonville, City Of | 3,012 | 2.78 ppb |
| Rogue River, City Of | 2,345 | 0.71 ppb |
| Gold Hill, City Of | 1,335 | 0 (not detected) |
| Hiland Wc - Shady Cove | 1,000 | 0 (not detected) |
What to do in your house
Test your own tap with a certified lab first-draw sample; Medford, OR 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 Cobblestone 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. The lead result guide covers how utilities pick the homes they sample. Size matters more than most people expect: small vs large water systems.