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
MS0490022 , Stewart Water Assc #2
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, 2022 – Dec 31, 2024 | 5 | 0.124 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2022 – Dec 31, 2024 | 5 | 0.001 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2019 – Dec 31, 2021 | 5 | 0.308 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2019 – Dec 31, 2021 | 5 | 0.0032 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2016 – Dec 31, 2018 | 5 | 0.2941 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2016 – Dec 31, 2018 | 5 | 0.0017 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2014 – Dec 31, 2016 | 5 | 0.1353 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2014 – Dec 31, 2016 | 5 | 0.001 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2011 – Dec 31, 2013 | 5 | 0.15 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2011 – Dec 31, 2013 | 5 | 0.0008 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2008 – Dec 31, 2010 | 5 | 0.1611 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2008 – Dec 31, 2010 | 5 | 0.001 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2007 – Dec 31, 2007 | 5 | 0.3799 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2007 – Dec 31, 2007 | 5 | 0.0024 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2006 – Dec 31, 2006 | 5 | 0.0351 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2006 – Dec 31, 2006 | 5 | 0.0023 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2005 – Jun 30, 2005 | 10 | 0.2399 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2005 – Jun 30, 2005 | 10 | 0.0024 mg/l | DS000 | Accepted |
| Copper | Jul 1, 2004 – Dec 31, 2004 | 10 | 0.4105 mg/l | DS000 | Accepted |
| Lead | Jul 1, 2004 – Dec 31, 2004 | 10 | 0.002 mg/l | DS000 | Accepted |
| Copper | Jul 1, 2003 – Dec 31, 2003 | 5 | 0.312 mg/l | DS000 | Accepted |
| Lead | Jul 1, 2003 – Dec 31, 2003 | 5 | 0.002 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2002 – Jun 30, 2002 | 10 | 0.193 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2002 – Jun 30, 2002 | 10 | 0.001 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2001 – Jun 30, 2001 | 10 | 0.093 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2001 – Jun 30, 2001 | 10 | 0.001 mg/l | DS000 | Accepted |
| Copper | Jul 1, 2000 – Dec 31, 2000 | 5 | 0.211 mg/l | DS000 | Accepted |
| Lead | Jul 1, 2000 – Dec 31, 2000 | 5 | 0.001 mg/l | DS000 | Accepted |
| Copper | Jul 1, 1998 – Dec 31, 1998 | 10 | 0.087 mg/l | DS000 | Accepted |
| Lead | Jul 1, 1998 – Dec 31, 1998 | 10 | 0.003 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.