Delft Colony Water, CA
Lead detected, under the action levels
Latest 90th-percentile lead: 2 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.
About Delft Colony Water
Delft Colony Water serves about 412 people through 99 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 Tulare County, California. EPA system ID: CA5403023; phone on file: 559-624-7191. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Lead results over time
That is up 2 ppb from 0 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Delft Colony Water is 2 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 2 ppb |
| 2022 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 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. Delft Colony Water's 2 ppb sits at the 78th percentile in California and the 71st nationally (higher means more lead).
Other water systems in Tulare County
90 other systems share Tulare County; 10 of them have a higher latest lead result than Delft Colony Water. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Cws - Visalia | 153,522 | 0 (not detected) |
| Tulare, City Of | 72,241 | 0 (not detected) |
| Porterville, City Of | 63,487 | 0 (not detected) |
| Dinuba, City Of | 27,641 | 0 (not detected) |
| Lindsay, City Of | 12,659 | 0 (not detected) |
| Exeter, City Of | 11,169 | 11 ppb |
| Farmersville, City Of | 10,243 | 1.3 ppb |
| Orosi Public Utility District | 8,300 | 0 (not detected) |
| Woodlake, City Of | 7,918 | 0 (not detected) |
| Earlimart Pud | 7,679 | 0 (not detected) |
What to do in your house
Test your own tap with a certified lab first-draw sample; Visalia, 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 Delft Colony Water 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.