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
MS0690053 , Hidden Valley Light Assn
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, 2021 – Dec 31, 2023 | 5 | 0.057 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2021 – Dec 31, 2023 | 5 | 0.0014 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2018 – Dec 31, 2020 | 5 | 0.044 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2018 – Dec 31, 2020 | 5 | 0.0074 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2017 – Dec 31, 2019 | 5 | 0.0975 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2017 – Dec 31, 2019 | 5 | 0.0045 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2016 – Dec 31, 2016 | 5 | 0.1397 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2016 – Dec 31, 2016 | 5 | 0.004 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2015 – Dec 31, 2015 | 5 | 0.182 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2015 – Dec 31, 2015 | 5 | 0.004 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2014 – Dec 31, 2014 | 5 | 0.163 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2014 – Dec 31, 2014 | 5 | 0.004 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2013 – Jun 30, 2013 | 5 | 0.3535 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2013 – Jun 30, 2013 | 5 | 0.009 mg/l | DS000 | Accepted |
| Copper | Jul 1, 2012 – Dec 31, 2012 | 5 | 0.3125 mg/l | DS000 | Accepted |
| Lead | Jul 1, 2012 – Dec 31, 2012 | 5 | 0.0062 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2012 – Jun 30, 2012 | 5 | 0.261 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2012 – Jun 30, 2012 | 5 | 0.016 mg/l | DS000 | Accepted |
| Copper | Jul 1, 2011 – Dec 31, 2011 | 5 | 0.3069 mg/l | DS000 | Accepted |
| Lead | Jul 1, 2011 – Dec 31, 2011 | 5 | 0.0114 mg/l | DS000 | Accepted |
| Copper | Jan 1, 2011 – Jun 30, 2011 | 5 | 0.3089 mg/l | DS000 | Accepted |
| Lead | Jan 1, 2011 – Jun 30, 2011 | 5 | 0.0147 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.