Lead and copper

MS0010007 , Oakland Water Works

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 Oakland Water Works, 24 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	10	0.0417 mg/l	DS000	Accepted
Lead	Jan 1, 2023 – Dec 31, 2025	10	0.0031 mg/l	DS000	Accepted
Copper	Jan 1, 2020 – Dec 31, 2022	10	0.201 mg/l	DS000	Accepted
Lead	Jan 1, 2020 – Dec 31, 2022	10	0.0061 mg/l	DS000	Accepted
Copper	Jan 1, 2017 – Dec 31, 2019	10	0.4109 mg/l	DS000	Accepted
Lead	Jan 1, 2017 – Dec 31, 2019	10	0.0026 mg/l	DS000	Accepted
Copper	Jan 1, 2015 – Dec 31, 2017	10	0.3069 mg/l	DS000	Accepted
Lead	Jan 1, 2015 – Dec 31, 2017	10	0.0041 mg/l	DS000	Accepted
Copper	Jan 1, 2012 – Dec 31, 2014	10	0.5215 mg/l	DS000	Accepted
Lead	Jan 1, 2012 – Dec 31, 2014	10	0.0077 mg/l	DS000	Accepted
Copper	Jan 1, 2009 – Dec 31, 2011	12	0.1181 mg/l	DS000	Accepted
Lead	Jan 1, 2009 – Dec 31, 2011	12	0.0035 mg/l	DS000	Accepted
Copper	Jan 1, 2006 – Dec 31, 2008	10	0.2049 mg/l	DS000	Accepted
Lead	Jan 1, 2006 – Dec 31, 2008	10	0.0028 mg/l	DS000	Accepted
Copper	Jan 1, 2000 – Dec 31, 2002	20	0.361 mg/l	DS000	Accepted
Lead	Jan 1, 2000 – Dec 31, 2002	20	0.013 mg/l	DS000	Accepted
Copper	Jan 1, 1996 – Dec 31, 1996	10	0.389 mg/l	DS000	Accepted
Lead	Jan 1, 1996 – Dec 31, 1996	10	0.004 mg/l	DS000	Accepted
Copper	Jan 1, 1995 – Dec 31, 1995	10	0.482 mg/l	DS000	Accepted
Lead	Jan 1, 1995 – Dec 31, 1995	10	0.004 mg/l	DS000	Accepted
Copper	Jan 1, 1994 – Jun 30, 1994	21	0.379 mg/l	DS000	Accepted
Lead	Jan 1, 1994 – Jun 30, 1994	21	0.003 mg/l	DS000	Accepted
Copper	Jul 1, 1993 – Dec 31, 1993	22	0.405 mg/l	DS000	Accepted
Lead	Jul 1, 1993 – Dec 31, 1993	22	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.