This is a rebuild of Drinking Water Watch and not yet the official record. Use the agency’s current Drinking Water Watch for anything you need to rely on.
Lead and copper
MS0410044 , North Lee W/A-SWS #1
Every monitoring period on record is listed here. This page applies no date range. The same list limited to the last two years.
| Analyte | Monitoring period | Samples | 90th percentile | Facility | Data quality |
|---|---|---|---|---|---|
| Copper | Jan 1, 2025 – Dec 31, 2025 | 10 | 0.0218 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2025 – Dec 31, 2025 | 10 | 0 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2024 – Dec 31, 2024 | 10 | 0.0066 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2024 – Dec 31, 2024 | 10 | 0 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2023 – Dec 31, 2023 | 10 | 0.0348 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2023 – Dec 31, 2023 | 10 | 0 mg/l | DS000 | Accepted |
| Copper | Jul 1, 2022 – Dec 31, 2022 | 20 | 0.0559 mg/l | DS000 | Accepted |
| Lead | Jul 1, 2022 – Dec 31, 2022 | 20 | 0.0006 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2022 – Jun 30, 2022 | 20 | 0.0392 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2022 – Jun 30, 2022 | 20 | 0.0005 mg/l | DS000 | Accepted |
| Copper | Jul 1, 2021 – Dec 31, 2021 | 20 | 0.0392 mg/l | DS000 | Accepted |
| Lead | Jul 1, 2021 – Dec 31, 2021 | 20 | 0.0009 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2021 – Jun 30, 2021 | 20 | 0.0659 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2021 – Jun 30, 2021 | 20 | 0.0023 mg/l | DS000 | Accepted |
| Copper | Jul 1, 2020 – Dec 31, 2020 | 20 | 0.0791 mg/l | DS000 | Accepted |
| Lead | Jul 1, 2020 – Dec 31, 2020 | 20 | 0.0009 mg/l | DS000 | Accepted |
| Copper | Jul 1, 2019 – Dec 31, 2019 | 19 | 0.1066 mg/l | DS000 | Accepted |
| Lead | Jul 1, 2019 – Dec 31, 2019 | 19 | 0.0015 mg/l | DS000 | Accepted |
No date of receipt is recorded for any of these summaries.
What the 90th percentile is
The 90th percentile of all samples collected from the distribution system is the standard that the US Environmental Protection Agency has chosen for determining compliance with the Lead and Copper Action Level under the federal Lead and Copper Rule. The 90th percentile is determined by ranking all sample results from lowest to highest and finding a result that is 90% of the number of sample results from the top. For example, if there are 10 sample results, the 90th percentile would be the 9th sample result from the top.
From the help text published with these pages.