Coraopolis Water & Sewer Auth, PA
Lead detected, under the action levels
Latest 90th-percentile lead: 4.33 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.
Who runs the water here
Coraopolis Water & Sewer Auth serves about 5,804 people through 2,616 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 Allegheny County, Pennsylvania. EPA system ID: PA5020010; phone on file: 412-264-3003. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Coraopolis Water & Sewer Auth's lead record
That is up 2.52 ppb from 1.81 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Coraopolis Water & Sewer Auth is 5 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 4.33 ppb |
| 2022 | 1.81 ppb |
| 2019 | 3.33 ppb |
| 2016 | 5 ppb |
How Coraopolis Water & Sewer Auth compares
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. Coraopolis Water & Sewer Auth's 4.33 ppb sits at the 65th percentile in Pennsylvania and the 89th nationally (higher means more lead).
Nearby utilities
36 other systems share Allegheny County; 4 of them have a higher latest lead result than Coraopolis Water & Sewer Auth. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Pa Amer Water Co-Pittsburgh | 686,000 | 4 ppb |
| Pittsburgh Water & Sewer Auth | 520,000 | 2 ppb |
| West View Water Authority | 200,000 | 0 (not detected) |
| Wilkinsburg-Penn Jt Water Auth | 125,000 | 9.78 ppb |
| Hampton Shaler Water Authority | 61,949 | 1.26 ppb |
| Monroeville Municipal Auth | 48,500 | 1.5 ppb |
| Oakmont Water Authority | 39,901 | 0.46 ppb |
| Moon Twp Muni Auth | 38,000 | 1.87 ppb |
| West Cnty Muni Auth-Mckeesport | 32,644 | 0 (not detected) |
| Plum Boro Muni Auth | 27,500 | 3.7 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Coraopolis, 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 Coraopolis Water & Sewer 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. The action level is dropping - the 10 ppb rule from 2027.