Lead and copper

MS0440018 , Columbus Air Force Base

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 Columbus Air Force Base, 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, 2022 – Dec 31, 2024	20	0.0553 mg/l	DS000	Accepted
Lead	Jan 1, 2022 – Dec 31, 2024	20	0.0014 mg/l	DS000	Accepted
Copper	Jan 1, 2019 – Dec 31, 2021	20	0.101 mg/l	DS000	Accepted
Lead	Jan 1, 2019 – Dec 31, 2021	20	0.003 mg/l	DS000	Accepted
Copper	Jan 1, 2016 – Dec 31, 2018	20	0.0374 mg/l	DS000	Accepted
Lead	Jan 1, 2016 – Dec 31, 2018	20	0.0022 mg/l	DS000	Accepted
Copper	Jan 1, 2014 – Dec 31, 2016	20	0.0413 mg/l	DS000	Accepted
Lead	Jan 1, 2014 – Dec 31, 2016	20	0.0005 mg/l	DS000	Accepted
Copper	Jan 1, 2011 – Dec 31, 2013	21	0.0777 mg/l	DS000	Accepted
Lead	Jan 1, 2011 – Dec 31, 2013	21	0.005 mg/l	DS000	Accepted
Copper	Jan 1, 2008 – Dec 31, 2010	21	0.042 mg/l	DS000	Accepted
Lead	Jan 1, 2008 – Dec 31, 2010	21	0.002 mg/l	DS000	Accepted
Copper	Jan 1, 2005 – Dec 31, 2007	40	0.0387 mg/l	DS000	Accepted
Lead	Jan 1, 2005 – Dec 31, 2007	40	0.002 mg/l	DS000	Accepted
Copper	Jan 1, 2002 – Dec 31, 2004	20	0.017 mg/l	DS000	Accepted
Lead	Jan 1, 2002 – Dec 31, 2004	20	0.001 mg/l	DS000	Accepted
Copper	Jan 1, 1999 – Dec 31, 2001	20	0.042 mg/l	DS000	Accepted
Lead	Jan 1, 1999 – Dec 31, 2001	20	0.001 mg/l	DS000	Accepted
Copper	Jan 1, 1996 – Dec 31, 1998	20	0 mg/l	DS000	Accepted
Lead	Jan 1, 1996 – Dec 31, 1998	20	0.001 mg/l	DS000	Accepted
Copper	Jan 1, 1995 – Dec 31, 1995	20	0.343 mg/l	DS000	Accepted
Lead	Jan 1, 1995 – Dec 31, 1995	20	0.007 mg/l	DS000	Accepted
Copper	Jan 1, 1994 – Dec 31, 1994	21	0.614 mg/l	DS000	Accepted
Lead	Jan 1, 1994 – Dec 31, 1994	21	0.009 mg/l	DS000	Accepted
Copper	Jan 1, 1993 – Jun 30, 1993	40	0.15 mg/l	DS000	Accepted
Lead	Jan 1, 1993 – Jun 30, 1993	40	0.006 mg/l	DS000	Accepted
Copper	Jul 1, 1992 – Dec 31, 1992	40	0.21 mg/l	DS000	Accepted
Lead	Jul 1, 1992 – Dec 31, 1992	40	0.005 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.