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
MS0270024 , Humphreys Co-Tchula Lake #7
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 | 0.113 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 | 0.3 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2019 – Dec 31, 2021 | 5 | 0.003 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2016 – Dec 31, 2018 | 5 | 0.0714 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2016 – Dec 31, 2018 | 5 | 0.0017 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2013 – Dec 31, 2015 | 5 | 0.1855 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2013 – Dec 31, 2015 | 5 | 0.001 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2010 – Dec 31, 2012 | 5 | 0.2349 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2010 – Dec 31, 2012 | 5 | 0 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2007 – Dec 31, 2009 | 5 | 0.0682 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2007 – Dec 31, 2009 | 5 | 0 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2004 – Dec 31, 2006 | 5 | 0.6573 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2004 – Dec 31, 2006 | 5 | 0.0005 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2003 – Dec 31, 2003 | 5 | 0.792 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2003 – Dec 31, 2003 | 5 | 0.001 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2002 – Dec 31, 2002 | 9 | 0.026 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2002 – Dec 31, 2002 | 9 | 0.001 mg/l | DS000 | Accepted |
| Copper | Jul 1, 2001 – Dec 31, 2001 | 11 | 0.026 mg/l | DS000 | Accepted |
| Lead | Jul 1, 2001 – Dec 31, 2001 | 11 | 0.001 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2001 – Jun 30, 2001 | 10 | 0.051 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 | 0.049 mg/l | DS000 | Accepted |
| Lead | Jul 1, 2000 – Dec 31, 2000 | 5 | 0.018 mg/l | DS000 | Accepted |
| Copper | Jul 1, 1996 – Dec 31, 1996 | 5 | 0.123 mg/l | DS000 | Accepted |
| Lead | Jul 1, 1996 – Dec 31, 1996 | 5 | 0.001 mg/l | DS000 | Accepted |
| Copper | Jan 1, 1996 – Jun 30, 1996 | 5 | 0.096 mg/l | DS000 | Accepted |
| Lead | Jan 1, 1996 – Jun 30, 1996 | 5 | 0.003 mg/l | DS000 | Accepted |
| Copper | Jan 1, 1995 – Dec 31, 1995 | 5 | 0.218 mg/l | DS000 | Accepted |
| Lead | Jan 1, 1995 – Dec 31, 1995 | 5 | 0.177 mg/l | DS000 | Accepted |
| Copper | Jan 1, 1994 – Jun 30, 1994 | 10 | 0.261 mg/l | DS000 | Accepted |
| Lead | Jan 1, 1994 – Jun 30, 1994 | 10 | 0.008 mg/l | DS000 | Accepted |
| Copper | Jul 1, 1993 – Dec 31, 1993 | 10 | 0.855 mg/l | DS000 | Accepted |
| Lead | Jul 1, 1993 – Dec 31, 1993 | 10 | 0.009 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.