Greencastle Area Water Auth, PA
Lead detected, under the action levels
Latest 90th-percentile lead: 5.21 ppb (monitoring period 2025-2025). 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 Greencastle Area Water Auth
Greencastle Area Water Auth serves about 5,500 people through 2,431 service connections, which makes it a medium-sized system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Franklin County, Pennsylvania. EPA system ID: PA7280014; phone on file: 717-597-7143. 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 down 4.99 ppb from 10.2 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Greencastle Area Water Auth is 10.2 ppb across 4 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 5.21 ppb |
| 2022 | 10.2 ppb over 10 |
| 2019 | 6 ppb |
| 2016 | 0 (not detected) |
Where this result ranks
Of the 516 Pennsylvania systems with a lead result, the median latest reading is 2 ppb; 143 are over 15 ppb right now and 156 have gone over at some point. Greencastle Area Water Auth's 5.21 ppb sits at the 68th percentile in Pennsylvania and the 92nd nationally (higher means more lead).
Neighbouring systems
29 other systems share Franklin County; 3 of them have a higher latest lead result than Greencastle Area Water Auth. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Chambersburg Boro Water Sys | 31,048 | 4.7 ppb |
| Guilford Water Auth | 28,135 | 0 (not detected) |
| Boro Of Waynesboro | 13,200 | 6 ppb |
| Bear Valley Joint Auth | 12,589 | 3.89 ppb |
| Washington Twp Muni Auth | 6,134 | 1.84 ppb |
| Franklin System York Water | 4,400 | 2 ppb |
| Mercersburg Muni Water Auth | 2,350 | - |
| Mont Alto Municipal Authority | 1,705 | - |
| Antrim Township Municipal Auth | 1,149 | - |
| Zullinger Water System Wtma | 1,080 | - |
What to do in your house
Test your own tap with a certified lab first-draw sample; Greencastle, PA 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 Greencastle Area Water Auth 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.