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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 71–80 of 162 samples, newest first — collected August 14, 2014 to March 20, 2017. The summary above covers all 162.

58 results from the 10 samples listed here: 4 detected, 54 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 71 to 80 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
Mar 20, 2017 12:30
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
170321-023NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 20, 2017 12:30, sampling point TF080 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2017 – Dec 31, 2017
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Mar 20, 2017 12:30, sampling point TF080 Nitrate 1040 EPA method QC10107041C Jan 1, 2017 – Dec 31, 2017
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Mar 20, 2017 12:30, sampling point TF080 Nitrite 1041 EPA method QC10107041C Jan 1, 2017 – Dec 31, 2017
Collected
Sep 21, 2016 01:00
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
160922-015TH
Laboratory
MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Sep 21, 2016 01:00, sampling point MRT000 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Sep 21, 2016 01:00, sampling point MRT000 Bromoform 2942 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Sep 21, 2016 01:00, sampling point MRT000 Bromodichloromethane 2943 EPA method 524.2 Not recorded
1.07 ug/l , sample collected Sep 21, 2016 01:00, sampling point MRT000 Dibromochloromethane 2944 EPA method 524.2 Not recorded
1.07 ug/l , sample collected Sep 21, 2016 01:00, sampling point MRT000 TTHM 2950 Jan 1, 2014 – Dec 31, 2016
Collected
Sep 21, 2016 01:00
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
160922-015HA
Laboratory
MSDH Lab
Not detected below 0.002 mg/l Minimum Reporting Level , sample collected Sep 21, 2016 01:00, sampling point MRT000 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Sep 21, 2016 01:00, sampling point MRT000 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Sep 21, 2016 01:00, sampling point MRT000 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Sep 21, 2016 01:00, sampling point MRT000 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Sep 21, 2016 01:00, sampling point MRT000 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
Not detected below 0.006 mg/l Minimum Reporting Level , sample collected Sep 21, 2016 01:00, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 Jan 1, 2014 – Dec 31, 2016
Collected
May 3, 2016 13:37
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
160504-033NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected May 3, 2016 13:37, sampling point TF080 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2016 – Dec 31, 2016
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected May 3, 2016 13:37, sampling point TF080 Nitrate 1040 EPA method QC10107041C Jan 1, 2016 – Dec 31, 2016
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected May 3, 2016 13:37, sampling point TF080 Nitrite 1041 EPA method QC10107041C Jan 1, 2016 – Dec 31, 2016
Collected
Mar 7, 2016 12:40
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
160308-028IN
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 7, 2016 12:40, sampling point TF080 Arsenic 1005 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
0.0435 mg/l , sample collected Mar 7, 2016 12:40, sampling point TF080 Barium 1010 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 7, 2016 12:40, sampling point TF080 Cadmium 1015 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 7, 2016 12:40, sampling point TF080 Chromium 1020 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 7, 2016 12:40, sampling point TF080 Fluoride 1025 EPA method 300.0 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 7, 2016 12:40, sampling point TF080 Mercury 1035 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 7, 2016 12:40, sampling point TF080 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Mar 7, 2016 12:40, sampling point TF080 Selenium 1045 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 7, 2016 12:40, sampling point TF080 Antimony, Total 1074 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 7, 2016 12:40, sampling point TF080 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 7, 2016 12:40, sampling point TF080 Thallium, Total 1085 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Collected
Oct 15, 2015 01:30
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
151016-011VO
Laboratory
MSDH Lab
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 15, 2015 01:30, sampling point TF080 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 15, 2015 01:30, sampling point TF080 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 15, 2015 01:30, sampling point TF080 Xylenes, Total 2955 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 15, 2015 01:30, sampling point TF080 Dichloromethane 2964 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 15, 2015 01:30, sampling point TF080 O-Dichlorobenzene 2968 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 15, 2015 01:30, sampling point TF080 P-Dichlorobenzene 2969 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 15, 2015 01:30, sampling point TF080 Vinyl Chloride 2976 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 15, 2015 01:30, sampling point TF080 1,1-Dichloroethylene 2977 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 15, 2015 01:30, sampling point TF080 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 15, 2015 01:30, sampling point TF080 1,2-Dichloroethane 2980 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 15, 2015 01:30, sampling point TF080 1,1,1-Trichloroethane 2981 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 15, 2015 01:30, sampling point TF080 Carbon Tetrachloride 2982 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 15, 2015 01:30, sampling point TF080 1,2-Dichloropropane 2983 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 15, 2015 01:30, sampling point TF080 Trichloroethylene 2984 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 15, 2015 01:30, sampling point TF080 1,1,2-Trichloroethane 2985 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 15, 2015 01:30, sampling point TF080 Tetrachloroethylene 2987 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 15, 2015 01:30, sampling point TF080 Chlorobenzene 2989 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 15, 2015 01:30, sampling point TF080 Benzene 2990 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 15, 2015 01:30, sampling point TF080 Toluene 2991 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 15, 2015 01:30, sampling point TF080 Ethylbenzene 2992 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 15, 2015 01:30, sampling point TF080 Styrene 2996 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Collected
Jun 17, 2015 02:30
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
150618-050CN
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Jun 17, 2015 02:30, sampling point TF080 Cyanide 1024 EPA method QC10204001X Jan 1, 2014 – Dec 31, 2016
Collected
May 4, 2015 12:35
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
150505-091NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected May 4, 2015 12:35, sampling point TF080 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2015 – Dec 31, 2015
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected May 4, 2015 12:35, sampling point TF080 Nitrate 1040 EPA method QC10107041C Jan 1, 2015 – Dec 31, 2015
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected May 4, 2015 12:35, sampling point TF080 Nitrite 1041 EPA method QC10107041C Jan 1, 2015 – Dec 31, 2015
Collected
Nov 10, 2014 12:15
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
141111-010NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Nov 10, 2014 12:15, sampling point TF080 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2014 – Dec 31, 2014
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Nov 10, 2014 12:15, sampling point TF080 Nitrate 1040 EPA method QC10107041C Jan 1, 2014 – Dec 31, 2014
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Nov 10, 2014 12:15, sampling point TF080 Nitrite 1041 EPA method QC10107041C Jan 1, 2014 – Dec 31, 2014
Collected
Aug 14, 2014 06:30
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
140815-083PB
Laboratory
MSDH Lab
0.0334 mg/l , sample collected Aug 14, 2014 06:30, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2012 – Dec 31, 2014
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Aug 14, 2014 06:30, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2012 – Dec 31, 2014

Routine (10).