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This is a rebuild of Drinking Water Watch and not yet the official record. Use the agency’s current Drinking Water Watch for anything you need to rely on.

Chemical and radiological sample results

MS0540023 , Eureka Water Association

23 of the 62 analytes this system has been tested for have been detected at least once, across 162 samples on record.

The other 39 were tested for and never found. An analyte is counted here if any result on record measured it, so this covers the whole history and not the samples listed below.

Across all 162 samples on record, detections range from October 13, 2003 to December 9, 2025. These figures cover the whole record.

What counts as a non-detect is defined in the help: Less than Indicator. This system’s violations.

What has been detected, ever

Every analyte measured above its reporting level at any point in this system’s record, most often detected first. This is not limited to the samples listed below.

Every analyte ever detected for Eureka Water Association, with how many results found it and when it was first and last detected. Covers the whole record, not only the samples listed below.
Analyte Kind Detected in First detected Last detected
Copper, Free 1022 Inorganic Chemical 66 of 66 results Aug 9, 2007 Sep 26, 2023
Lead 1030 Inorganic Chemical 22 of 66 results Aug 9, 2007 Sep 26, 2023
Barium 1010 Inorganic Chemical 10 of 10 results Oct 13, 2003 Mar 26, 2025
TTHM 2950 Organic Chemical 9 of 19 results Jul 28, 2004 Dec 9, 2025
Dibromochloromethane 2944 Organic Chemical 6 of 14 results Jun 16, 2010 Dec 9, 2025
Chromium 1020 Inorganic Chemical 5 of 10 results Oct 13, 2003 Mar 26, 2025
Gross Alpha, Incl. Radon & U 4002 Radionuclide 5 of 5 results Dec 13, 2011 Jul 19, 2012
Nickel 1036 Inorganic Chemical 4 of 10 results Mar 15, 2004 Mar 26, 2025
Sulfate 1055 Inorganic Chemical 4 of 4 results Oct 13, 2003 Jun 3, 2021
Sodium 1052 Inorganic Chemical 3 of 3 results Oct 15, 2019 Jun 3, 2021
Calcium 1016 Inorganic Chemical 2 of 2 results Jun 3, 2021 Jun 3, 2021
Chloride 1017 Inorganic Chemical 2 of 2 results Jun 3, 2021 Jun 3, 2021
Fluoride 1025 Inorganic Chemical 2 of 12 results Jun 3, 2021 Jun 3, 2021
Conductivity @ 25 C Umhos/CM 1064 Water Quality 2 of 2 results Jun 3, 2021 Jun 3, 2021
Color 1905 Water Quality 2 of 2 results Jun 3, 2021 Jun 3, 2021
Alkalinity, Total 1927 Water Quality 2 of 2 results Jun 3, 2021 Jun 3, 2021
Bromoform 2942 Organic Chemical 2 of 14 results Jun 16, 2010 Aug 29, 2013
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 2 of 19 results Sep 4, 2007 Jun 16, 2010
Selenium 1045 Inorganic Chemical 2 of 10 results Mar 15, 2004 Apr 11, 2005
Bromodichloromethane 2943 Organic Chemical 1 of 14 results Aug 29, 2013 Aug 29, 2013
Cadmium 1015 Inorganic Chemical 1 of 10 results Apr 11, 2005 Apr 11, 2005
Dichloromethane 2964 Organic Chemical 1 of 13 results Aug 25, 2004 Aug 25, 2004
Beryllium, Total 1075 Inorganic Chemical 1 of 10 results Mar 15, 2004 Mar 15, 2004

No date range is applied: this list draws on every sample on record. Show the last two years only.

The most recent samples, result by result

The table below lists 111–120 of 162 samples, newest first — collected June 16, 2010 to August 17, 2011. The summary above covers all 162.

25 results from the 10 samples listed here: 14 detected, 11 not detected. Across the whole record it is 156 of 794. A sample is analysed for many analytes at once, so one sample appears on as many rows as it had results.

Chemical and radiological sample results for Eureka Water Association, every result from 111 to 120 of 162 samples shown, newest first. Not detected means the amount was below the level the laboratory can reliably report, which is given beside it.
Result Analyte Monitoring period
Collected
Aug 17, 2011
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
110818-017PB
Laboratory
MSDH Lab
0.0569 mg/l , sample collected Aug 17, 2011, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2009 – Dec 31, 2011
0.0023 mg/l , sample collected Aug 17, 2011, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2009 – Dec 31, 2011
Collected
Aug 17, 2011
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
110818-016PB
Laboratory
MSDH Lab
0.2295 mg/l , sample collected Aug 17, 2011, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2009 – Dec 31, 2011
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Aug 17, 2011, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2009 – Dec 31, 2011
Collected
Aug 17, 2011
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
110818-052PB
Laboratory
MSDH Lab
0.0274 mg/l , sample collected Aug 17, 2011, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2009 – Dec 31, 2011
0.0008 mg/l , sample collected Aug 17, 2011, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2009 – Dec 31, 2011
Collected
Aug 17, 2011
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
110818-060PB
Laboratory
MSDH Lab
0.0566 mg/l , sample collected Aug 17, 2011, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2009 – Dec 31, 2011
0.0012 mg/l , sample collected Aug 17, 2011, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2009 – Dec 31, 2011
Collected
Aug 17, 2011
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
110818-058PB
Laboratory
MSDH Lab
0.069 mg/l , sample collected Aug 17, 2011, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2009 – Dec 31, 2011
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Aug 17, 2011, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2009 – Dec 31, 2011
Collected
Aug 17, 2011
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
110818-020PB
Laboratory
MSDH Lab
0.0067 mg/l , sample collected Aug 17, 2011, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2009 – Dec 31, 2011
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Aug 17, 2011, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2009 – Dec 31, 2011
Collected
Aug 17, 2011
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
110818-015PB
Laboratory
MSDH Lab
0.057 mg/l , sample collected Aug 17, 2011, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2009 – Dec 31, 2011
0.0017 mg/l , sample collected Aug 17, 2011, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2009 – Dec 31, 2011
Collected
Mar 9, 2011
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
110310-036NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 9, 2011, sampling point TF080 Nitrate-Nitrite 1038 EPA method 353.2 Jan 1, 2011 – Dec 31, 2011
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Mar 9, 2011, sampling point TF080 Nitrate 1040 EPA method 353.2 Jan 1, 2011 – Dec 31, 2011
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Mar 9, 2011, sampling point TF080 Nitrite 1041 EPA method 353.2 Jan 1, 2011 – Dec 31, 2011
Collected
Aug 30, 2010
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
100831-091NI
Laboratory
MSDH Lab
Not detected below 0.25 mg/l Minimum Reporting Level , sample collected Aug 30, 2010, sampling point TF080 Nitrate-Nitrite 1038 EPA method 353.2 Jan 1, 2010 – Dec 31, 2010
Not detected below 0.2 mg/l Minimum Reporting Level , sample collected Aug 30, 2010, sampling point TF080 Nitrate 1040 EPA method 353.2 Jan 1, 2010 – Dec 31, 2010
Not detected below 0.05 mg/l Minimum Reporting Level , sample collected Aug 30, 2010, sampling point TF080 Nitrite 1041 EPA method 353.2 Jan 1, 2010 – Dec 31, 2010
Collected
Jun 16, 2010
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
100617-014TH
Laboratory
MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jun 16, 2010, sampling point MRT000 Chloroform 2941 EPA method 524.2 Not recorded
1.21 ug/l , sample collected Jun 16, 2010, sampling point MRT000 Bromoform 2942 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jun 16, 2010, sampling point MRT000 Bromodichloromethane 2943 EPA method 524.2 Not recorded
2.28 ug/l , sample collected Jun 16, 2010, sampling point MRT000 Dibromochloromethane 2944 EPA method 524.2 Not recorded
3.49 ug/l , sample collected Jun 16, 2010, sampling point MRT000 TTHM 2950 EPA method 524.2 Jan 1, 2008 – Dec 31, 2010

Routine (10).