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
MS0090005 , City of Houston
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 | 20 | 0.264 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2022 – Dec 31, 2024 | 20 | 0.0046 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2019 – Dec 31, 2021 | 20 | 0.179 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2019 – Dec 31, 2021 | 20 | 0.0025 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2016 – Dec 31, 2018 | 20 | 0.1807 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2016 – Dec 31, 2018 | 20 | 0.0025 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2013 – Dec 31, 2015 | 20 | 0.1537 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2013 – Dec 31, 2015 | 20 | 0.0017 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2011 – Dec 31, 2013 | 20 | 0.107 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2011 – Dec 31, 2013 | 20 | 0.0024 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2008 – Dec 31, 2010 | 20 | 0.1993 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2008 – Dec 31, 2010 | 20 | 0.0023 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2005 – Dec 31, 2007 | 20 | 0.1712 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2005 – Dec 31, 2007 | 20 | 0.0017 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2002 – Dec 31, 2004 | 20 | 0.1426 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2002 – Dec 31, 2004 | 20 | 0.0025 mg/l | DS000 | Accepted |
| Copper | Jan 1, 1999 – Dec 31, 2001 | 20 | 0.138 mg/l | DS000 | Accepted |
| Lead | Jan 1, 1999 – Dec 31, 2001 | 20 | 0.004 mg/l | DS000 | Accepted |
| Copper | Jan 1, 1996 – Dec 31, 1998 | 20 | 0.169 mg/l | DS000 | Accepted |
| Lead | Jan 1, 1996 – Dec 31, 1998 | 20 | 0.003 mg/l | DS000 | Accepted |
| Copper | Jan 1, 1995 – Dec 31, 1995 | 20 | 0.093 mg/l | DS000 | Accepted |
| Lead | Jan 1, 1995 – Dec 31, 1995 | 20 | 0.005 mg/l | DS000 | Accepted |
| Copper | Jan 1, 1994 – Dec 31, 1994 | 20 | 0.134 mg/l | DS000 | Accepted |
| Lead | Jan 1, 1994 – Dec 31, 1994 | 20 | 0.003 mg/l | DS000 | Accepted |
| Copper | Jan 1, 1993 – Jun 30, 1993 | 42 | 0.161 mg/l | DS000 | Accepted |
| Lead | Jan 1, 1993 – Jun 30, 1993 | 42 | 0.004 mg/l | DS000 | Accepted |
| Copper | Jul 1, 1992 – Dec 31, 1992 | 42 | 0.21 mg/l | DS000 | Accepted |
| Lead | Jul 1, 1992 – Dec 31, 1992 | 42 | 0.012 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.