Oak Dell Park, CA
Exceeded the action level in the past
Latest 90th-percentile lead: 1 ppb (monitoring period 2026-2026). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
Who runs the water here
Oak Dell Park serves about 104 people through 53 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Santa Clara County, California. EPA system ID: CA4300603; phone on file: 408-205-9068. They can tell you what your service line is made of and whether they pay to replace it.
Every lead result on file
Against the period ending 2025 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Oak Dell Park is 35.3 ppb across 10 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 1 ppb |
| 2025 | 0 (not detected) |
| 2024 | 1.1 ppb |
| 2024 | 2.8 ppb |
| 2023 | 35.3 ppb over 15 |
| 2020 | 5.5 ppb |
| 2020 | 5.5 ppb |
| 2017 | 5.52 ppb |
| 2017 | 5.52 ppb |
| 2016 | 13 ppb over 10 |
How Oak Dell Park 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. Oak Dell Park's 1 ppb sits at the 70th percentile in California and the 51st nationally (higher means more lead).
Neighbouring systems
72 other systems share Santa Clara County; 22 of them have a higher latest lead result than Oak Dell Park. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| San Jose Water | 1,039,920 | 0 (not detected) |
| City Of Sunnyvale | 157,566 | 0 (not detected) |
| City Of Santa Clara | 134,587 | 2.7 ppb |
| Great Oaks Wc Inc | 112,582 | 0 (not detected) |
| City Of San Jose - Evg/Edv/Coy | 99,783 | 0 (not detected) |
| City Of Milpitas | 81,915 | 2.5 ppb |
| City Of Mountain View | 81,340 | 0 (not detected) |
| City Of Palo Alto | 67,658 | 0 (not detected) |
| Cwsc Los Altos Suburban | 63,559 | 1.5 ppb |
| City Of Gilroy | 59,426 | 2 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Saratoga, 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 Oak Dell Park 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. Why an old exceedance still matters: over the limit before, under it now.