Lower Rock Creek Mutual Water Co., CA
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2018-2020). 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.
Lower Rock Creek Mutual Water Co. at a glance
Lower Rock Creek Mutual Water Co. serves about 310 people through 112 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 Mono County, California. EPA system ID: CA2600538; phone on file: 760-387-0070. They can tell you what your service line is made of and whether they pay to replace it.
Every lead result on file
That is down 5 ppb from 5 ppb in the period ending 2017. The highest 90th-percentile result EPA holds for Lower Rock Creek Mutual Water Co. is 5 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2020 | 0 (not detected) |
| 2017 | 5 ppb |
| 2016 | 0 (not detected) |
Where this result ranks
Of the 2,884 California systems with a lead result, the median latest reading is 0 ppb; 30 are over 15 ppb right now and 215 have gone over at some point. Lower Rock Creek Mutual Water Co.'s reported as 0 (not detected) sits at the 33rd percentile in California and the 19th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
17 other systems share Mono County; 13 of them have a higher latest lead result than Lower Rock Creek Mutual Water Co.. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Mammoth Cwd | 8,234 | 1.5 ppb |
| Mountain Meadows Mwc | 525 | 4.4 ppb |
| Usmc - Housing Coleville | 424 | 1.3 ppb |
| Bridgeport Pud | 374 | 1.9 ppb |
| June Lake Pud - Down Canyon | 310 | 2 ppb |
| Usmc/Mtn Warfare Trng Ctr - Bridgeport | 300 | 1 ppb |
| June Lake Pud Village | 263 | 2.7 ppb |
| Crowley Lake Trailer Park | 230 | 9.4 ppb |
| Lee Vining Public Utility District | 222 | 8 ppb |
| Lundy Mutual Water Company | 200 | 3.7 ppb |
Your move
Look up your address in Lower Rock Creek Mutual Water Co.'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 Lower Rock Creek Mutual Water Co. 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. A zero today does not rule out a jump later - the rules are tightening in 2027.