Lead and copper

MS0680002 , Charleston Utilities

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 Charleston Utilities, 32 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, 2021 – Dec 31, 2023	20	0.0275 mg/l	DS000	Accepted
Lead	Jan 1, 2021 – Dec 31, 2023	20	0.0007 mg/l	DS000	Accepted
Copper	Jan 1, 2018 – Dec 31, 2020	19	0.03 mg/l	DS000	Accepted
Lead	Jan 1, 2018 – Dec 31, 2020	19	0.0005 mg/l	DS000	Accepted
Copper	Jan 1, 2015 – Dec 31, 2017	22	0.4337 mg/l	DS000	Accepted
Lead	Jan 1, 2015 – Dec 31, 2017	22	0.0015 mg/l	DS000	Accepted
Copper	Jan 1, 2012 – Dec 31, 2014	20	0.492 mg/l	DS000	Accepted
Lead	Jan 1, 2012 – Dec 31, 2014	20	0.0019 mg/l	DS000	Accepted
Copper	Jan 1, 2009 – Dec 31, 2011	20	0.4138 mg/l	DS000	Accepted
Lead	Jan 1, 2009 – Dec 31, 2011	20	0.002 mg/l	DS000	Accepted
Copper	Jan 1, 2008 – Dec 31, 2008	20	0.2613 mg/l	DS000	Accepted
Lead	Jan 1, 2008 – Dec 31, 2008	20	0.002 mg/l	DS000	Accepted
Copper	Jan 1, 2007 – Dec 31, 2007	20	0.1723 mg/l	DS000	Accepted
Lead	Jan 1, 2007 – Dec 31, 2007	20	0.0007 mg/l	DS000	Accepted
Copper	Jan 1, 2006 – Dec 31, 2006	20	0.3237 mg/l	DS000	Accepted
Lead	Jan 1, 2006 – Dec 31, 2006	20	0.0015 mg/l	DS000	Accepted
Copper	Jan 1, 2004 – Dec 31, 2004	40	0.3456 mg/l	DS000	Accepted
Lead	Jan 1, 2004 – Dec 31, 2004	40	0.0056 mg/l	DS000	Accepted
Copper	Jan 1, 2001 – Dec 31, 2001	10	0.421 mg/l	DS000	Accepted
Lead	Jan 1, 2001 – Dec 31, 2001	10	0.002 mg/l	DS000	Accepted
Copper	Jan 1, 1999 – Dec 31, 1999	10	0.42 mg/l	DS000	Accepted
Lead	Jan 1, 1999 – Dec 31, 1999	10	0.004 mg/l	DS000	Accepted
Copper	Jul 1, 1996 – Dec 31, 1996	10	0 mg/l	DS000	Accepted
Lead	Jul 1, 1996 – Dec 31, 1996	10	0 mg/l	DS000	Accepted
Copper	Jan 1, 1996 – Jun 30, 1996	0	0 mg/l	DS000	Accepted
Lead	Jan 1, 1996 – Jun 30, 1996	10	0.002 mg/l	DS000	Accepted
Copper	Jan 1, 1995 – Dec 31, 1995	10	0.412 mg/l	DS000	Accepted
Lead	Jan 1, 1995 – Dec 31, 1995	10	0.03 mg/l	DS000	Accepted
Copper	Jan 1, 1994 – Jun 30, 1994	20	0.654 mg/l	DS000	Accepted
Lead	Jan 1, 1994 – Jun 30, 1994	20	0.008 mg/l	DS000	Accepted
Copper	Jul 1, 1993 – Dec 31, 1993	20	0.885 mg/l	DS000	Accepted
Lead	Jul 1, 1993 – Dec 31, 1993	20	0.009 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.