Big Oak Rehab, NJ
Lead detected, under the action levels
Latest 90th-percentile lead: 3.75 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. 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
Big Oak Rehab serves about 259 people through 1 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Salem County, New Jersey. EPA system ID: NJ1710304; phone on file: 856-451-5000. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
That is up 3.75 ppb from 0 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Big Oak Rehab is 12.3 ppb across 16 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 3.75 ppb |
| 2025 | 0 (not detected) |
| 2025 | 0 (not detected) |
| 2024 | 4.57 ppb |
| 2024 | 1.1 ppb |
| 2023 | 1.2 ppb |
| 2023 | 1.2 ppb |
| 2022 | 0.9 ppb |
| 2022 | 0 (not detected) |
| 2021 | 0.44 ppb |
| 2020 | 0.43 ppb |
| 2019 | 0 (not detected) |
| 2018 | 0.34 ppb |
| 2017 | 0.09 ppb |
| 2017 | 4.7 ppb |
| 2016 | 12.3 ppb over 10 |
Against other New Jersey systems
Of the 605 New Jersey systems with a lead result, the median latest reading is 1 ppb; 5 are over 15 ppb right now and 52 have gone over at some point. Big Oak Rehab's 3.75 ppb sits at the 84th percentile in New Jersey and the 86th nationally (higher means more lead).
Other water systems in Salem County
14 other systems share Salem County; 3 of them have a higher latest lead result than Big Oak Rehab. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Nj American Water - Penns Grove | 14,406 | 0 (not detected) |
| Pennsville Twsp. Water Depart. | 13,500 | 0 (not detected) |
| Nj American Water - Salem City | 4,794 | 2 ppb |
| Woodstown Water Department | 4,455 | 0 (not detected) |
| Elmer Boro W Dept | 1,385 | 1.5 ppb |
| Harding Woods Mhp | 1,276 | 0 (not detected) |
| Holly Tree Acres System 1 | 300 | 0 (not detected) |
| Country Club Estates | 300 | 5.3 ppb |
| Picnic Grove Mobile Homes | 250 | 0.46 ppb |
| Auburn Village Water Sup | 200 | 6.9 ppb |
Next steps for Elmer, NJ
Test your own tap with a certified lab first-draw sample; Elmer, NJ 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 Big Oak Rehab whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 3753 ppb (copper action level 1,300 ppb).
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.