Lead and copper

MS0750005 , Hilldale Water District

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 Hilldale Water District, 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, 2023 – Dec 31, 2025	20	0.188 mg/l	DS000	Accepted
Lead	Jan 1, 2023 – Dec 31, 2025	20	0.0021 mg/l	DS000	Accepted
Copper	Jan 1, 2020 – Dec 31, 2022	20	0.193 mg/l	DS000	Accepted
Lead	Jan 1, 2020 – Dec 31, 2022	20	0.0012 mg/l	DS000	Accepted
Copper	Jan 1, 2017 – Dec 31, 2019	20	0.1511 mg/l	DS000	Accepted
Lead	Jan 1, 2017 – Dec 31, 2019	20	0.0019 mg/l	DS000	Accepted
Copper	Jan 1, 2014 – Dec 31, 2016	21	0.2121 mg/l	DS000	Accepted
Lead	Jan 1, 2014 – Dec 31, 2016	21	0.0019 mg/l	DS000	Accepted
Copper	Jan 1, 2011 – Dec 31, 2013	20	0.1721 mg/l	DS000	Accepted
Lead	Jan 1, 2011 – Dec 31, 2013	20	0.003 mg/l	DS000	Accepted
Copper	Jan 1, 2008 – Dec 31, 2010	21	0.269 mg/l	DS000	Accepted
Lead	Jan 1, 2008 – Dec 31, 2010	21	0.0028 mg/l	DS000	Accepted
Copper	Jan 1, 2005 – Dec 31, 2007	20	0.226 mg/l	DS000	Accepted
Lead	Jan 1, 2005 – Dec 31, 2007	20	0.002 mg/l	DS000	Accepted
Copper	Jan 1, 2002 – Dec 31, 2004	20	0.2522 mg/l	DS000	Accepted
Lead	Jan 1, 2002 – Dec 31, 2004	20	0.0026 mg/l	DS000	Accepted
Copper	Jan 1, 1999 – Dec 31, 2001	20	0.251 mg/l	DS000	Accepted
Lead	Jan 1, 1999 – Dec 31, 2001	20	0.013 mg/l	DS000	Accepted
Copper	Jan 1, 1996 – Dec 31, 1998	19	0.131 mg/l	DS000	Accepted
Lead	Jan 1, 1996 – Dec 31, 1998	19	0.005 mg/l	DS000	Accepted
Copper	Jan 1, 1995 – Dec 31, 1995	20	0.153 mg/l	DS000	Accepted
Lead	Jan 1, 1995 – Dec 31, 1995	20	0.004 mg/l	DS000	Accepted
Copper	Jan 1, 1994 – Dec 31, 1994	20	0.186 mg/l	DS000	Accepted
Lead	Jan 1, 1994 – Dec 31, 1994	20	0.007 mg/l	DS000	Accepted
Copper	Jan 1, 1993 – Jun 30, 1993	40	0.219 mg/l	DS000	Accepted
Lead	Jan 1, 1993 – Jun 30, 1993	40	0.004 mg/l	DS000	Accepted
Copper	Jul 1, 1992 – Dec 31, 1992	40	0.23 mg/l	DS000	Accepted
Lead	Jul 1, 1992 – Dec 31, 1992	40	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.