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
MS0100017 , Union W/A
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, 2024 – Dec 31, 2024 | 5 | 0.0678 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2024 – Dec 31, 2024 | 5 | 0 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2023 – Dec 31, 2023 | 5 | 0.0783 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2023 – Dec 31, 2023 | 5 | 0.00052 mg/l | DS000 | Accepted |
| Copper | Jul 1, 2022 – Dec 31, 2022 | 10 | 0.116 mg/l | DS000 | Accepted |
| Lead | Jul 1, 2022 – Dec 31, 2022 | 10 | 0.0011 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2022 – Jun 30, 2022 | 10 | 0.0271 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2022 – Jun 30, 2022 | 10 | 0.0006 mg/l | DS000 | Accepted |
| Copper | Jul 1, 2021 – Dec 31, 2021 | 10 | 0.0978 mg/l | DS000 | Accepted |
| Lead | Jul 1, 2021 – Dec 31, 2021 | 10 | 0.0016 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2018 – Dec 31, 2020 | 5 | 0.5256 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2018 – Dec 31, 2020 | 5 | 0.0506 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2015 – Dec 31, 2017 | 7 | 0.051 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2015 – Dec 31, 2017 | 7 | 0.0007 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2012 – Dec 31, 2014 | 5 | 0.0814 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2012 – Dec 31, 2014 | 5 | 0.001 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2011 – Dec 31, 2011 | 5 | 0.1188 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2011 – Dec 31, 2011 | 5 | 0.0004 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2010 – Dec 31, 2010 | 5 | 0.1248 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2010 – Dec 31, 2010 | 5 | 0.0009 mg/l | DS000 | Accepted |
| Copper | Jul 1, 2009 – Dec 31, 2009 | 10 | 0.0959 mg/l | DS000 | Accepted |
| Lead | Jul 1, 2009 – Dec 31, 2009 | 10 | 0.0007 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2009 – Jun 30, 2009 | 10 | 0.0658 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2009 – Jun 30, 2009 | 10 | 0 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2006 – Dec 31, 2008 | 5 | 0.1364 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2006 – Dec 31, 2008 | 5 | 0.0631 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2003 – Dec 31, 2005 | 5 | 0.1788 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2003 – Dec 31, 2005 | 5 | 0.0006 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2000 – Dec 31, 2002 | 5 | 0.015 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2000 – Dec 31, 2002 | 5 | 0 mg/l | DS000 | Accepted |
| Copper | Jan 1, 1996 – Dec 31, 1996 | 5 | 0.028 mg/l | DS000 | Accepted |
| Lead | Jan 1, 1996 – Dec 31, 1996 | 5 | 0.002 mg/l | DS000 | Accepted |
| Copper | Jan 1, 1995 – Dec 31, 1995 | 5 | 0 mg/l | DS000 | Accepted |
| Lead | Jan 1, 1995 – Dec 31, 1995 | 5 | 0 mg/l | DS000 | Accepted |
| Copper | Jan 1, 1994 – Jun 30, 1994 | 10 | 0.202 mg/l | DS000 | Accepted |
| Lead | Jan 1, 1994 – Jun 30, 1994 | 10 | 0.002 mg/l | DS000 | Accepted |
| Copper | Jul 1, 1993 – Dec 31, 1993 | 10 | 0.328 mg/l | DS000 | Accepted |
| Lead | Jul 1, 1993 – Dec 31, 1993 | 10 | 0.004 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.