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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 21–30 of 162 samples, newest first — collected October 11, 2022 to September 26, 2023. The summary above covers all 162.

27 results from the 10 samples listed here: 6 detected, 21 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.

We withheld the location of 5 sampling points below. The location on record identifies a private home, and we do not publish those. That is our decision, not the agency’s. The sampling point, its type and every result taken there are published unchanged.

Chemical and radiological sample results for Eureka Water Association, every result from 21 to 30 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
Sep 26, 2023 07:00
Sampling point
LC0017 Location withheld
Sample type
Routine
Lab sample
PB-230927-046
Laboratory
MSDH Lab
0.0226 mg/l , sample collected Sep 26, 2023 07:00, sampling point LC0017 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 26, 2023 07:00, sampling point LC0017 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Sep 26, 2023 06:30
Sampling point
LC0016 Location withheld
Sample type
Routine
Lab sample
PB-230927-043
Laboratory
MSDH Lab
0.0437 mg/l , sample collected Sep 26, 2023 06:30, sampling point LC0016 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 26, 2023 06:30, sampling point LC0016 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Sep 26, 2023 07:30
Sampling point
LC0012 Location withheld
Sample type
Routine
Lab sample
PB-230927-049
Laboratory
MSDH Lab
0.0103 mg/l , sample collected Sep 26, 2023 07:30, sampling point LC0012 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 26, 2023 07:30, sampling point LC0012 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Sep 26, 2023 06:40
Sampling point
LC0009 Location withheld
Sample type
Routine
Lab sample
PB-230927-050
Laboratory
MSDH Lab
0.0358 mg/l , sample collected Sep 26, 2023 06:40, sampling point LC0009 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 26, 2023 06:40, sampling point LC0009 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Sep 25, 2023 07:50
Sampling point
LC0013 Location withheld
Sample type
Routine
Lab sample
PB-230927-048
Laboratory
MSDH Lab
0.0109 mg/l , sample collected Sep 25, 2023 07:50, sampling point LC0013 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 25, 2023 07:50, sampling point LC0013 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Jun 21, 2023 12:20
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
TH-230622-004
Laboratory
MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jun 21, 2023 12:20, sampling point MRT000 TTHM 2950 EPA method 524.2 Not recorded
Collected
Jun 21, 2023 12:20
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
HA-230622-004
Laboratory
MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jun 21, 2023 12:20, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Not recorded
Collected
Mar 7, 2023 13:00
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
NI-230308-080
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 7, 2023 13:00, sampling point TF080 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2023 – Dec 31, 2023
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Mar 7, 2023 13:00, sampling point TF080 Nitrate 1040 EPA method QC10107041C Jan 1, 2023 – Dec 31, 2023
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Mar 7, 2023 13:00, sampling point TF080 Nitrite 1041 EPA method QC10107041C Jan 1, 2023 – Dec 31, 2023
Collected
Dec 13, 2022 13:06
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
CN-221214-001
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Dec 13, 2022 13:06, sampling point TF080 Cyanide 1024 EPA method QC10204001X Jan 1, 2020 – Dec 31, 2022
Collected
Oct 11, 2022 12:30
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
IN-221012-006
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 11, 2022 12:30, sampling point TF080 Arsenic 1005 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.0644 mg/l , sample collected Oct 11, 2022 12:30, sampling point TF080 Barium 1010 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 11, 2022 12:30, sampling point TF080 Cadmium 1015 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 11, 2022 12:30, sampling point TF080 Chromium 1020 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Oct 11, 2022 12:30, sampling point TF080 Fluoride 1025 EPA method QC 10-109-12-2-A Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 11, 2022 12:30, sampling point TF080 Mercury 1035 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 11, 2022 12:30, sampling point TF080 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Oct 11, 2022 12:30, sampling point TF080 Selenium 1045 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 11, 2022 12:30, sampling point TF080 Antimony, Total 1074 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 11, 2022 12:30, sampling point TF080 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 11, 2022 12:30, sampling point TF080 Thallium, Total 1085 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022

Routine (10).