Colusa Co. Wwd #2 - Princeton, CA
Lead detected, under the action levels
Latest 90th-percentile lead: 1.3 ppb (monitoring period 2023-2025). 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.
Colusa Co. Wwd #2 - Princeton at a glance
Colusa Co. Wwd #2 - Princeton serves about 382 people through 128 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 Colusa County, California. EPA system ID: CA0600013; phone on file: 530-682-2378. 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 up 1.3 ppb from 0 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Colusa Co. Wwd #2 - Princeton is 1.3 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1.3 ppb |
| 2022 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2016 | 0 (not detected) |
How Colusa Co. Wwd #2 - Princeton compares
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. Colusa Co. Wwd #2 - Princeton's 1.3 ppb sits at the 73rd percentile in California and the 60th nationally (higher means more lead).
Other water systems in Colusa County
8 other systems share Colusa County; 2 of them have a higher latest lead result than Colusa Co. Wwd #2 - Princeton. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| City Of Colusa | 6,675 | 6.8 ppb |
| City Of Williams | 5,538 | 0 (not detected) |
| Arbuckle Public Utility District | 3,251 | 0 (not detected) |
| Maxwell Public Utility District | 1,175 | 0.98 ppb |
| Colusa Co. Wwd #1 - Grimes | 512 | 5.77 ppb |
| Colusa Co. Service Area #1-Century Ranch | 450 | 0 (not detected) |
| Del Oro Wc - Arbuckle District | 185 | 0 (not detected) |
| Colusa Co. Service Area #2-Stonyford | 160 | 0 (not detected) |
Next steps for Princeton, CA
Test your own tap with a certified lab first-draw sample; Princeton, 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 Colusa Co. Wwd #2 - Princeton 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. What a 90th-percentile result does and does not tell you: how to read a lead result. Size matters more than most people expect: small vs large water systems.