Lead and copper

MS0410033 , Old Union Water System

Every monitoring period on record is listed here. This page applies no date range. The same list limited to the last two years.

Lead and copper 90th-percentile sample summaries for Old Union Water System, 28 summaries, every one on record. The agency records no date of receipt for any of them.
Analyte	Monitoring period	Samples	90th percentile	Facility	Data quality
Copper	Jan 1, 2023 – Dec 31, 2025	20	0.391 mg/l	DS000	Accepted
Lead	Jan 1, 2023 – Dec 31, 2025	20	0.0007 mg/l	DS000	Accepted
Copper	Jan 1, 2022 – Dec 31, 2022	20	0.0084 mg/l	DS000	Accepted
Lead	Jan 1, 2022 – Dec 31, 2022	20	0.0018 mg/l	DS000	Accepted
Copper	Jan 1, 2019 – Dec 31, 2021	16	0.15 mg/l	DS000	Accepted
Lead	Jan 1, 2019 – Dec 31, 2021	16	0.001 mg/l	DS000	Accepted
Copper	Jan 1, 2016 – Dec 31, 2018	20	0.0755 mg/l	DS000	Accepted
Lead	Jan 1, 2016 – Dec 31, 2018	20	0.0008 mg/l	DS000	Accepted
Copper	Jan 1, 2014 – Dec 31, 2016	20	0.1849 mg/l	DS000	Accepted
Lead	Jan 1, 2014 – Dec 31, 2016	20	0.0009 mg/l	DS000	Accepted
Copper	Jan 1, 2011 – Dec 31, 2013	20	0.138 mg/l	DS000	Accepted
Lead	Jan 1, 2011 – Dec 31, 2013	20	0.001 mg/l	DS000	Accepted
Copper	Jan 1, 2008 – Dec 31, 2010	20	0.1375 mg/l	DS000	Accepted
Lead	Jan 1, 2008 – Dec 31, 2010	20	0.0009 mg/l	DS000	Accepted
Copper	Jan 1, 2005 – Dec 31, 2007	20	0.2861 mg/l	DS000	Accepted
Lead	Jan 1, 2005 – Dec 31, 2007	20	0.0012 mg/l	DS000	Accepted
Copper	Jan 1, 2000 – Dec 31, 2002	10	0.168 mg/l	DS000	Accepted
Lead	Jan 1, 2000 – Dec 31, 2002	10	0.001 mg/l	DS000	Accepted
Copper	Jan 1, 1997 – Dec 31, 1999	10	0.131 mg/l	DS000	Accepted
Lead	Jan 1, 1997 – Dec 31, 1999	10	0.001 mg/l	DS000	Accepted
Copper	Jan 1, 1996 – Dec 31, 1996	10	0.242 mg/l	DS000	Accepted
Lead	Jan 1, 1996 – Dec 31, 1996	10	0.001 mg/l	DS000	Accepted
Copper	Jan 1, 1995 – Dec 31, 1995	10	0.152 mg/l	DS000	Accepted
Lead	Jan 1, 1995 – Dec 31, 1995	10	0.009 mg/l	DS000	Accepted
Copper	Jan 1, 1994 – Jun 30, 1994	20	0.127 mg/l	DS000	Accepted
Lead	Jan 1, 1994 – Jun 30, 1994	20	0.006 mg/l	DS000	Accepted
Copper	Jul 1, 1993 – Dec 31, 1993	21	0.107 mg/l	DS000	Accepted
Lead	Jul 1, 1993 – Dec 31, 1993	21	0.004 mg/l	DS000	Accepted

No date of receipt is recorded for any of these summaries.

This system’s violations

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.