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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 101–110 of 162 samples, newest first — collected August 17, 2011 to April 25, 2012. The summary above covers all 162.

23 results from the 10 samples listed here: 9 detected, 14 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 101 to 110 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
Apr 25, 2012 15:20
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
120426-049RU
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 25, 2012 15:20, sampling point TF080 Combined Uranium 4006 EPA method 200.8 Apr 1, 2012 – Jun 30, 2012
Collected
Mar 7, 2012 02:20
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
120308-052NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 7, 2012 02:20, sampling point TF080 Nitrate-Nitrite 1038 EPA method 353.2 Jan 1, 2012 – Dec 31, 2012
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Mar 7, 2012 02:20, sampling point TF080 Nitrate 1040 EPA method 353.2 Jan 1, 2012 – Dec 31, 2012
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Mar 7, 2012 02:20, sampling point TF080 Nitrite 1041 EPA method 353.2 Jan 1, 2012 – Dec 31, 2012
Collected
Feb 15, 2012 12:15
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
120216-011
Laboratory
Radiation Safety Engineering
0.5 pci/l , sample collected Feb 15, 2012 12:15, sampling point TF080 Gross Alpha, Incl. Radon & U 4002 EPA method 00-02 Not recorded
Not detected below 0.46 pci/l Minimum Reporting Level , sample collected Feb 15, 2012 12:15, sampling point TF080 Combined Radium (-226 & -228) 4010 Not recorded
Not detected below 0.341 pci/l Minimum Reporting Level , sample collected Feb 15, 2012 12:15, sampling point TF080 Radium-226 4020 EPA method 903.1 Jan 1, 2012 – Mar 31, 2012
Not detected below 0.46 pci/l Minimum Reporting Level , sample collected Feb 15, 2012 12:15, sampling point TF080 Radium-228 4030 EPA method 904.0 Jan 1, 2012 – Mar 31, 2012
Collected
Feb 15, 2012 12:15
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
120216-011RU
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 15, 2012 12:15, sampling point TF080 Combined Uranium 4006 EPA method 200.8 Jan 1, 2012 – Mar 31, 2012
Collected
Dec 13, 2011 12:35
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
111214-053
Laboratory
Radiation Safety Engineering
0.5 pci/l , sample collected Dec 13, 2011 12:35, sampling point TF080 Gross Alpha, Incl. Radon & U 4002 EPA method 00-02 Not recorded
Not detected below 0.46 pci/l Minimum Reporting Level , sample collected Dec 13, 2011 12:35, sampling point TF080 Combined Radium (-226 & -228) 4010 Not recorded
Not detected below 0.341 pci/l Minimum Reporting Level , sample collected Dec 13, 2011 12:35, sampling point TF080 Radium-226 4020 EPA method 903.1 Oct 1, 2011 – Dec 31, 2011
Not detected below 0.46 pci/l Minimum Reporting Level , sample collected Dec 13, 2011 12:35, sampling point TF080 Radium-228 4030 EPA method 904.0 Oct 1, 2011 – Dec 31, 2011
Collected
Aug 17, 2011
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
110818-059PB
Laboratory
MSDH Lab
0.0111 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
110818-053PB
Laboratory
MSDH Lab
0.0513 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
110818-051PB
Laboratory
MSDH Lab
0.0518 mg/l , sample collected Aug 17, 2011, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2009 – Dec 31, 2011
0.0019 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
110818-019PB
Laboratory
MSDH Lab
0.0813 mg/l , sample collected Aug 17, 2011, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2009 – Dec 31, 2011
0.0019 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
110818-018PB
Laboratory
MSDH Lab
0.0145 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

Routine (10).