Lead and copper

MS0580004 , Oak Hill 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 Oak Hill Water Assn, 22 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	10	0.399 mg/l	DS000	Accepted
Lead	Jan 1, 2021 – Dec 31, 2023	10	0 mg/l	DS000	Accepted
Copper	Jan 1, 2018 – Dec 31, 2020	10	0.365 mg/l	DS000	Accepted
Lead	Jan 1, 2018 – Dec 31, 2020	10	0.0007 mg/l	DS000	Accepted
Copper	Jan 1, 2015 – Dec 31, 2017	10	0.4143 mg/l	DS000	Accepted
Lead	Jan 1, 2015 – Dec 31, 2017	10	0.0013 mg/l	DS000	Accepted
Copper	Jan 1, 2012 – Dec 31, 2014	10	0.3989 mg/l	DS000	Accepted
Lead	Jan 1, 2012 – Dec 31, 2014	10	0.0006 mg/l	DS000	Accepted
Copper	Jan 1, 2009 – Dec 31, 2011	11	0.4513 mg/l	DS000	Accepted
Lead	Jan 1, 2009 – Dec 31, 2011	11	0.005 mg/l	DS000	Accepted
Copper	Jan 1, 2006 – Dec 31, 2008	11	0.3312 mg/l	DS000	Accepted
Lead	Jan 1, 2006 – Dec 31, 2008	11	0.0015 mg/l	DS000	Accepted
Copper	Jan 1, 2000 – Dec 31, 2002	10	0.309 mg/l	DS000	Accepted
Lead	Jan 1, 2000 – Dec 31, 2002	10	0.002 mg/l	DS000	Accepted
Copper	Jan 1, 1996 – Dec 31, 1996	10	0.226 mg/l	DS000	Accepted
Lead	Jan 1, 1996 – Dec 31, 1996	10	0.002 mg/l	DS000	Accepted
Copper	Jan 1, 1995 – Dec 31, 1995	10	0.313 mg/l	DS000	Accepted
Lead	Jan 1, 1995 – Dec 31, 1995	10	0.002 mg/l	DS000	Accepted
Copper	Jan 1, 1994 – Jun 30, 1994	20	0.463 mg/l	DS000	Accepted
Lead	Jan 1, 1994 – Jun 30, 1994	20	0.003 mg/l	DS000	Accepted
Copper	Jul 1, 1993 – Dec 31, 1993	20	0.448 mg/l	DS000	Accepted
Lead	Jul 1, 1993 – Dec 31, 1993	20	0.002 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.