Lead and copper

MS0300163 , Helena Utility 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 Helena Utility District, 44 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, 2026 – Dec 31, 2026	5	0.322 mg/l	DS000	Accepted
Lead	Jan 1, 2026 – Dec 31, 2026	5	0.0016 mg/l	DS000	Accepted
Copper	Jul 1, 2024 – Dec 31, 2024	10	0.395 mg/l	DS000	Accepted
Lead	Jul 1, 2024 – Dec 31, 2024	10	0.0033 mg/l	DS000	Accepted
Copper	Jan 1, 2024 – Jun 30, 2024	10	0.271 mg/l	DS000	Accepted
Lead	Jan 1, 2024 – Jun 30, 2024	10	0.0008 mg/l	DS000	Accepted
Copper	Jul 1, 2023 – Dec 31, 2023	10	0.383 mg/l	DS000	Accepted
Lead	Jul 1, 2023 – Dec 31, 2023	10	0.0015 mg/l	DS000	Accepted
Copper	Jan 1, 2023 – Jun 30, 2023	10	0.554 mg/l	DS000	Accepted
Lead	Jan 1, 2023 – Jun 30, 2023	10	0.003 mg/l	DS000	Accepted
Copper	Jul 1, 2022 – Dec 31, 2022	10	0.592 mg/l	DS000	Accepted
Lead	Jul 1, 2022 – Dec 31, 2022	10	0.0006 mg/l	DS000	Accepted
Copper	Jan 1, 2022 – Dec 31, 2022	5	0.529 mg/l	DS000	Accepted
Lead	Jan 1, 2022 – Dec 31, 2022	5	0.0265 mg/l	DS000	Accepted
Copper	Jan 1, 2021 – Dec 31, 2021	5	0.0129 mg/l	DS000	Accepted
Lead	Jan 1, 2021 – Dec 31, 2021	5	0.0007 mg/l	DS000	Accepted
Copper	Jul 1, 2018 – Dec 31, 2018	10	0.0657 mg/l	DS000	Accepted
Lead	Jul 1, 2018 – Dec 31, 2018	10	0.0005 mg/l	DS000	Accepted
Copper	Jan 1, 2018 – Jun 30, 2018	10	0.0356 mg/l	DS000	Accepted
Lead	Jan 1, 2018 – Jun 30, 2018	10	0.0008 mg/l	DS000	Accepted
Copper	Jul 1, 2017 – Dec 31, 2017	12	0.0195 mg/l	DS000	Accepted
Lead	Jul 1, 2017 – Dec 31, 2017	12	0.0121 mg/l	DS000	Accepted
Copper	Jan 1, 2017 – Jun 30, 2017	11	0.174 mg/l	DS000	Accepted
Lead	Jan 1, 2017 – Jun 30, 2017	11	0.0167 mg/l	DS000	Accepted
Copper	Jul 1, 2016 – Dec 31, 2016	10	0.1923 mg/l	DS000	Accepted
Lead	Jul 1, 2016 – Dec 31, 2016	10	0.0391 mg/l	DS000	Accepted
Copper	Jan 1, 2016 – Jun 30, 2016	11	0.1952 mg/l	DS000	Accepted
Lead	Jan 1, 2016 – Jun 30, 2016	11	0.0116 mg/l	DS000	Accepted
Copper	Jan 1, 2015 – Dec 31, 2015	5	0.0784 mg/l	DS000	Accepted
Lead	Jan 1, 2015 – Dec 31, 2015	5	0.0266 mg/l	DS000	Accepted
Copper	Jan 1, 2014 – Dec 31, 2014	5	0.211 mg/l	DS000	Accepted
Lead	Jan 1, 2014 – Dec 31, 2014	5	0.0033 mg/l	DS000	Accepted
Copper	Jan 1, 2013 – Jun 30, 2013	11	0.0275 mg/l	DS000	Accepted
Lead	Jan 1, 2013 – Jun 30, 2013	11	0.0014 mg/l	DS000	Accepted
Copper	Jul 1, 2012 – Dec 31, 2012	10	0.0414 mg/l	DS000	Accepted
Lead	Jul 1, 2012 – Dec 31, 2012	10	0.0008 mg/l	DS000	Accepted
Copper	Jan 1, 2012 – Jun 30, 2012	12	0.1443 mg/l	DS000	Accepted
Lead	Jan 1, 2012 – Jun 30, 2012	12	2.413 mg/l	DS000	Accepted
Copper	Jul 1, 2011 – Dec 31, 2011	11	0.1914 mg/l	DS000	Accepted
Lead	Jul 1, 2011 – Dec 31, 2011	11	0.0106 mg/l	DS000	Accepted
Copper	Jan 1, 2011 – Jun 30, 2011	11	0.1334 mg/l	DS000	Accepted
Lead	Jan 1, 2011 – Jun 30, 2011	11	0.015 mg/l	DS000	Accepted
Copper	Jul 1, 2010 – Dec 31, 2010	12	0.0832 mg/l	DS000	Accepted
Lead	Jul 1, 2010 – Dec 31, 2010	12	0.0143 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.