Lead and copper

MS0680004 , East Charleston Water Assn

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 East Charleston Water Assn, 34 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, 2025 – Dec 31, 2025	5	0.046 mg/l	DS000	Accepted
Lead	Jan 1, 2025 – Dec 31, 2025	5	0.001 mg/l	DS000	Accepted
Copper	Jan 1, 2024 – Dec 31, 2024	5	0.05 mg/l	DS000	Accepted
Lead	Jan 1, 2024 – Dec 31, 2024	5	0 mg/l	DS000	Accepted
Copper	Jan 1, 2022 – Dec 31, 2022	5	0.22 mg/l	DS000	Accepted
Lead	Jan 1, 2022 – Dec 31, 2022	5	0.0014 mg/l	DS000	Accepted
Copper	Jan 1, 2020 – Dec 31, 2020	4	0.0362 mg/l	DS000	Accepted
Lead	Jan 1, 2020 – Dec 31, 2020	4	0.001 mg/l	DS000	Accepted
Copper	Jan 1, 2019 – Dec 31, 2019	5	0.3193 mg/l	DS000	Accepted
Lead	Jan 1, 2019 – Dec 31, 2019	5	0.002 mg/l	DS000	Accepted
Copper	Jul 1, 2018 – Dec 31, 2018	10	0.438 mg/l	DS000	Accepted
Lead	Jul 1, 2018 – Dec 31, 2018	10	0.0045 mg/l	DS000	Accepted
Copper	Jan 1, 2018 – Jun 30, 2018	10	0.4664 mg/l	DS000	Accepted
Lead	Jan 1, 2018 – Jun 30, 2018	10	0.0044 mg/l	DS000	Accepted
Copper	Jan 1, 2015 – Dec 31, 2017	6	0.33 mg/l	DS000	Accepted
Lead	Jan 1, 2015 – Dec 31, 2017	6	0.0166 mg/l	DS000	Accepted
Copper	Jan 1, 2012 – Dec 31, 2014	6	0.3165 mg/l	DS000	Accepted
Lead	Jan 1, 2012 – Dec 31, 2014	6	0.0019 mg/l	DS000	Accepted
Copper	Jan 1, 2011 – Dec 31, 2013	6	0.3514 mg/l	DS000	Accepted
Lead	Jan 1, 2011 – Dec 31, 2013	6	0.002 mg/l	DS000	Accepted
Copper	Jan 1, 2009 – Dec 31, 2011	6	0.3514 mg/l	DS000	Accepted
Lead	Jan 1, 2009 – Dec 31, 2011	6	0.002 mg/l	DS000	Accepted
Copper	Jan 1, 2006 – Dec 31, 2008	6	0.3156 mg/l	DS000	Accepted
Lead	Jan 1, 2006 – Dec 31, 2008	6	0.0033 mg/l	DS000	Accepted
Copper	Jan 1, 2000 – Dec 31, 2002	5	0.054 mg/l	DS000	Accepted
Lead	Jan 1, 2000 – Dec 31, 2002	5	0.002 mg/l	DS000	Accepted
Copper	Jan 1, 1996 – Dec 31, 1996	5	0 mg/l	DS000	Accepted
Lead	Jan 1, 1996 – Dec 31, 1996	5	0.001 mg/l	DS000	Accepted
Copper	Jan 1, 1995 – Dec 31, 1995	5	0.103 mg/l	DS000	Accepted
Lead	Jan 1, 1995 – Dec 31, 1995	5	0.011 mg/l	DS000	Accepted
Copper	Jan 1, 1994 – Jun 30, 1994	10	0.513 mg/l	DS000	Accepted
Lead	Jan 1, 1994 – Jun 30, 1994	10	0.006 mg/l	DS000	Accepted
Copper	Jul 1, 1993 – Dec 31, 1993	10	0.674 mg/l	DS000	Accepted
Lead	Jul 1, 1993 – Dec 31, 1993	10	0.006 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.