Golden State Water Company - South Shore, CA
Lead detected, under the action levels
Latest 90th-percentile lead: 2.8 ppb (monitoring period 2022-2024). 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
Golden State Water Company - South Shore serves about 30 people through 24 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws surface water, in Lake County, California. EPA system ID: CA1700519; phone on file: 916-853-3632. They can tell you what your service line is made of and whether they pay to replace it.
Lead results over time
That is up 2.8 ppb from 0 ppb in the period ending 2021. The highest 90th-percentile result EPA holds for Golden State Water Company - South Shore is 4.2 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 2.8 ppb |
| 2021 | 0 (not detected) |
| 2017 | 4.2 ppb |
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. Golden State Water Company - South Shore's 2.8 ppb sits at the 83rd percentile in California and the 79th nationally (higher means more lead).
Neighbouring systems
41 other systems share Lake County; 8 of them have a higher latest lead result than Golden State Water Company - South Shore. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Highlands Mutual Water Company | 7,772 | 0 (not detected) |
| Hidden Valley Lake Csd | 6,235 | 0 (not detected) |
| Konocti County Water District | 5,928 | 0 (not detected) |
| Lakeport, City Of | 4,762 | 0 (not detected) |
| Golden State Water Co.-Clearlake System | 4,623 | 4.1 ppb |
| Mt. Konocti Mutual Water Company | 4,360 | 0 (not detected) |
| Kelseyville Co Waterworks District 3 | 4,102 | 5.2 ppb |
| Lake County Csa 21 - North Lakeport | 4,046 | 0 (not detected) |
| Cobb Area County Water District | 3,515 | 0 (not detected) |
| Nice Mutual Water Company | 2,929 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; Rancho Cordova, CA 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 Golden State Water Company - South Shore 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.