Lead and copper

MS0490006 , North District 1 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 North District 1 Water Assn., 46 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	0.113 mg/l	DS000	Accepted
Lead	Jan 1, 2023 – Dec 31, 2025	10	0.0016 mg/l	DS000	Accepted
Copper	Jan 1, 2022 – Dec 31, 2022	10	0.18 mg/l	DS000	Accepted
Lead	Jan 1, 2022 – Dec 31, 2022	10	0.0019 mg/l	DS000	Accepted
Copper	Jan 1, 2021 – Dec 31, 2021	10	0.586 mg/l	DS000	Accepted
Lead	Jan 1, 2021 – Dec 31, 2021	10	0.0018 mg/l	DS000	Accepted
Copper	Jan 1, 2020 – Dec 31, 2020	10	0.1669 mg/l	DS000	Accepted
Lead	Jan 1, 2020 – Dec 31, 2020	10	0.0016 mg/l	DS000	Accepted
Copper	Jul 1, 2019 – Dec 31, 2019	20	0.0787 mg/l	DS000	Accepted
Lead	Jul 1, 2019 – Dec 31, 2019	20	0.0013 mg/l	DS000	Accepted
Copper	Jan 1, 2019 – Jun 30, 2019	20	0.0772 mg/l	DS000	Accepted
Lead	Jan 1, 2019 – Jun 30, 2019	20	0.0014 mg/l	DS000	Accepted
Copper	Jul 1, 2018 – Dec 31, 2018	20	0.2463 mg/l	DS000	Accepted
Lead	Jul 1, 2018 – Dec 31, 2018	20	0.0027 mg/l	DS000	Accepted
Copper	Jan 1, 2018 – Jun 30, 2018	20	0.2167 mg/l	DS000	Accepted
Lead	Jan 1, 2018 – Jun 30, 2018	20	0.015 mg/l	DS000	Accepted
Copper	Jul 1, 2017 – Dec 31, 2017	10	1.0711 mg/l	DS000	Accepted
Lead	Jul 1, 2017 – Dec 31, 2017	10	0.0202 mg/l	DS000	Accepted
Copper	Jan 1, 2017 – Jun 30, 2017	20	0.2257 mg/l	DS000	Accepted
Lead	Jan 1, 2017 – Jun 30, 2017	20	0.0023 mg/l	DS000	Accepted
Copper	Jul 1, 2016 – Dec 31, 2016	20	1.1567 mg/l	DS000	Accepted
Lead	Jul 1, 2016 – Dec 31, 2016	20	0.0157 mg/l	DS000	Accepted
Copper	Jan 1, 2016 – Jun 30, 2016	20	1.1062 mg/l	DS000	Accepted
Lead	Jan 1, 2016 – Jun 30, 2016	20	0.0122 mg/l	DS000	Accepted
Copper	Jul 1, 2015 – Dec 31, 2015	20	1.3872 mg/l	DS000	Accepted
Lead	Jul 1, 2015 – Dec 31, 2015	20	0.0156 mg/l	DS000	Accepted
Copper	Jan 1, 2015 – Jun 30, 2015	20	0.1038 mg/l	DS000	Accepted
Lead	Jan 1, 2015 – Jun 30, 2015	20	0.0066 mg/l	DS000	Accepted
Copper	Jan 1, 2012 – Dec 31, 2014	10	0.7838 mg/l	DS000	Accepted
Lead	Jan 1, 2012 – Dec 31, 2014	10	0.0177 mg/l	DS000	Accepted
Copper	Jan 1, 2009 – Dec 31, 2011	10	0.0224 mg/l	DS000	Accepted
Lead	Jan 1, 2009 – Dec 31, 2011	10	0.0027 mg/l	DS000	Accepted
Copper	Jan 1, 2006 – Dec 31, 2008	10	0.8057 mg/l	DS000	Accepted
Lead	Jan 1, 2006 – Dec 31, 2008	10	0.0082 mg/l	DS000	Accepted
Copper	Jan 1, 2003 – Dec 31, 2005	10	1.075 mg/l	DS000	Accepted
Lead	Jan 1, 2003 – Dec 31, 2005	10	0.011 mg/l	DS000	Accepted
Copper	Jan 1, 2000 – Dec 31, 2002	70	0.798 mg/l	DS000	Accepted
Lead	Jan 1, 2000 – Dec 31, 2002	70	0.011 mg/l	DS000	Accepted
Copper	Jan 1, 1996 – Dec 31, 1996	10	0.615 mg/l	DS000	Accepted
Lead	Jan 1, 1996 – Dec 31, 1996	10	0.005 mg/l	DS000	Accepted
Copper	Jan 1, 1995 – Dec 31, 1995	10	0.582 mg/l	DS000	Accepted
Lead	Jan 1, 1995 – Dec 31, 1995	10	0.006 mg/l	DS000	Accepted
Copper	Jan 1, 1994 – Jun 30, 1994	20	0.288 mg/l	DS000	Accepted
Lead	Jan 1, 1994 – Jun 30, 1994	20	0.004 mg/l	DS000	Accepted
Copper	Jul 1, 1993 – Dec 31, 1993	20	0.479 mg/l	DS000	Accepted
Lead	Jul 1, 1993 – Dec 31, 1993	20	0.015 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.