Pa Amer Water Co, PA
Lead detected, under the action levels
Latest 90th-percentile lead: 3 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 Pa Amer Water Co
Pa Amer Water Co serves about 50,200 people through 20,279 service connections, which makes it a large system under EPA's size classes. It is privately owned and draws surface water, in Dauphin County, Pennsylvania. EPA system ID: PA7220017; phone on file: 717-533-5627. 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 ppb from 0 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Pa Amer Water Co is 3 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 3 ppb |
| 2022 | 0 (not detected) |
| 2019 | 3 ppb |
| 2016 | 2 ppb |
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. Pa Amer Water Co's 3 ppb sits at the 61st percentile in Pennsylvania and the 83rd nationally (higher means more lead).
Neighbouring systems
24 other systems share Dauphin County; 1 of them has a higher latest lead result than Pa Amer Water Co. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Veolia Water | 110,000 | 2.1 ppb |
| Capital Region Water | 66,540 | 0 (not detected) |
| Veolia Middletown | 9,600 | 3 ppb |
| Pa American Water Steelton | 6,428 | 1.7 ppb |
| Millersburg Water Auth | 4,600 | 0 (not detected) |
| Lykens Boro Auth | 3,220 | - |
| Elizabethville Area Auth | 2,700 | - |
| Williamstown Boro Auth | 2,390 | - |
| Halifax Area Water & Sewer Aut | 2,278 | - |
| Royalton Boro | 1,083 | - |
Next steps for Hummelstown, PA
Test your own tap with a certified lab first-draw sample; Hummelstown, 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 Pa Amer Water Co 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. Why sampled homes are the worst-case ones is in the guide to reading the number. The action level is dropping - the 10 ppb rule from 2027.