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; the list of samples further down is narrowed.

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

Showing samples collected between September 25, 2024 and September 25, 2026. That is this page’s default, not a limit on what the agency records.

Show every sample on record

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The most recent samples, result by result

The 6 samples collected between September 25, 2024 and September 25, 2026 are listed below, newest first.

48 results from the 6 samples listed here: 9 detected, 39 not detected. 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 2 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 the 6 samples on record, 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 Dec 9, 2025 12:30 Sampling point SM2 Location withheld Sample type Routine Lab sample 810-174683-1 Laboratory Eurofins Eaton Analytical South Bend in
Not detected below 2 ug/l Minimum Reporting Level , sample collected Dec 9, 2025 12:30, sampling point SM2	Monochloroacetic Acid 2450 EPA method 552.2	Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Dec 9, 2025 12:30, sampling point SM2	Dichloroacetic Acid 2451 EPA method 552.2	Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Dec 9, 2025 12:30, sampling point SM2	Trichloroacetic Acid 2452 EPA method 552.2	Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Dec 9, 2025 12:30, sampling point SM2	Monobromoacetic Acid 2453 EPA method 552.2	Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Dec 9, 2025 12:30, sampling point SM2	Dibromoacetic Acid 2454 EPA method 552.2	Not recorded
Not detected below 2 ug/l Minimum Reporting Level , sample collected Dec 9, 2025 12:30, sampling point SM2	Total Haloacetic Acids (Haa5) 2456 EPA method 552.2	Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Dec 9, 2025 12:30, sampling point SM2	Chloroform 2941 EPA method 524.2	Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Dec 9, 2025 12:30, sampling point SM2	Bromoform 2942 EPA method 524.2	Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Dec 9, 2025 12:30, sampling point SM2	Bromodichloromethane 2943 EPA method 524.2	Not recorded
0.6 ug/l , sample collected Dec 9, 2025 12:30, sampling point SM2	Dibromochloromethane 2944 EPA method 524.2	Not recorded
0.6 ug/l , sample collected Dec 9, 2025 12:30, sampling point SM2	TTHM 2950 EPA method 524.2	Jan 1, 2025 – Dec 31, 2025
Collected Oct 1, 2025 12:30 Sampling point TF080 Treatment Plant T080 Sample type Routine Lab sample CN-251002-006 Laboratory MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Oct 1, 2025 12:30, sampling point TF080	Cyanide 1024 EPA method QC10204001X	Jan 1, 2023 – Dec 31, 2025
Collected Mar 26, 2025 12:10 Sampling point TF080 Treatment Plant T080 Sample type Routine Lab sample IN-250327-023 Laboratory MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 26, 2025 12:10, sampling point TF080	Arsenic 1005 EPA method 200.8	Jan 1, 2023 – Dec 31, 2025
0.0664 mg/l , sample collected Mar 26, 2025 12:10, sampling point TF080	Barium 1010 EPA method 200.8	Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 26, 2025 12:10, sampling point TF080	Cadmium 1015 EPA method 200.8	Jan 1, 2023 – Dec 31, 2025
0.0007 mg/l , sample collected Mar 26, 2025 12:10, sampling point TF080	Chromium 1020 EPA method 200.8	Jan 1, 2023 – Dec 31, 2025
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 26, 2025 12:10, sampling point TF080	Fluoride 1025 EPA method QC 10-109-12-2-A	Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 26, 2025 12:10, sampling point TF080	Mercury 1035 EPA method 200.8	Jan 1, 2023 – Dec 31, 2025
0.0007 mg/l , sample collected Mar 26, 2025 12:10, sampling point TF080	Nickel 1036 EPA method 200.8	Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Mar 26, 2025 12:10, sampling point TF080	Selenium 1045 EPA method 200.8	Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 26, 2025 12:10, sampling point TF080	Antimony, Total 1074 EPA method 200.8	Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 26, 2025 12:10, sampling point TF080	Beryllium, Total 1075 EPA method 200.8	Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 26, 2025 12:10, sampling point TF080	Thallium, Total 1085 EPA method 200.8	Jan 1, 2023 – Dec 31, 2025
Collected Mar 26, 2025 12:30 Sampling point TF080 Treatment Plant T080 Sample type Routine Lab sample NI-250327-001 Laboratory MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 26, 2025 12:30, sampling point TF080	Nitrate-Nitrite 1038 EPA method QC10107041C	Jan 1, 2025 – Dec 31, 2025
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Mar 26, 2025 12:30, sampling point TF080	Nitrate 1040 EPA method QC10107041C	Jan 1, 2025 – Dec 31, 2025
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Mar 26, 2025 12:30, sampling point TF080	Nitrite 1041 EPA method QC10107041C	Jan 1, 2025 – Dec 31, 2025
Collected Dec 9, 2024 13:00 Sampling point SM2 Location withheld Sample type Routine Lab sample 810-130860-2 Laboratory Eurofins Eaton Analytical South Bend in
Not detected below 2 ug/l Minimum Reporting Level , sample collected Dec 9, 2024 13:00, sampling point SM2	Monochloroacetic Acid 2450 EPA method 552.2	Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Dec 9, 2024 13:00, sampling point SM2	Dichloroacetic Acid 2451 EPA method 552.2	Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Dec 9, 2024 13:00, sampling point SM2	Trichloroacetic Acid 2452 EPA method 552.2	Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Dec 9, 2024 13:00, sampling point SM2	Monobromoacetic Acid 2453 EPA method 552.2	Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Dec 9, 2024 13:00, sampling point SM2	Dibromoacetic Acid 2454 EPA method 552.2	Not recorded
Not detected below 2 ug/l Minimum Reporting Level , sample collected Dec 9, 2024 13:00, sampling point SM2	Total Haloacetic Acids (Haa5) 2456 EPA method 552.2	Oct 1, 2024 – Dec 31, 2024
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Dec 9, 2024 13:00, sampling point SM2	Chloroform 2941 EPA method 524.2	Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Dec 9, 2024 13:00, sampling point SM2	Bromoform 2942 EPA method 524.2	Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Dec 9, 2024 13:00, sampling point SM2	Bromodichloromethane 2943 EPA method 524.2	Not recorded
0.61 ug/l , sample collected Dec 9, 2024 13:00, sampling point SM2	Dibromochloromethane 2944 EPA method 524.2	Not recorded
0.61 ug/l , sample collected Dec 9, 2024 13:00, sampling point SM2	TTHM 2950 EPA method 524.2	Oct 1, 2024 – Dec 31, 2024
Collected Dec 9, 2024 12:30 Sampling point SM1 Location withheld Sample type Routine Lab sample 810-130860-1 Laboratory Eurofins Eaton Analytical South Bend in
Not detected below 2 ug/l Minimum Reporting Level , sample collected Dec 9, 2024 12:30, sampling point SM1	Monochloroacetic Acid 2450 EPA method 552.2	Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Dec 9, 2024 12:30, sampling point SM1	Dichloroacetic Acid 2451 EPA method 552.2	Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Dec 9, 2024 12:30, sampling point SM1	Trichloroacetic Acid 2452 EPA method 552.2	Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Dec 9, 2024 12:30, sampling point SM1	Monobromoacetic Acid 2453 EPA method 552.2	Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Dec 9, 2024 12:30, sampling point SM1	Dibromoacetic Acid 2454 EPA method 552.2	Not recorded
Not detected below 2 ug/l Minimum Reporting Level , sample collected Dec 9, 2024 12:30, sampling point SM1	Total Haloacetic Acids (Haa5) 2456 EPA method 552.2	Oct 1, 2024 – Dec 31, 2024
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Dec 9, 2024 12:30, sampling point SM1	Chloroform 2941 EPA method 524.2	Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Dec 9, 2024 12:30, sampling point SM1	Bromoform 2942 EPA method 524.2	Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Dec 9, 2024 12:30, sampling point SM1	Bromodichloromethane 2943 EPA method 524.2	Not recorded
0.58 ug/l , sample collected Dec 9, 2024 12:30, sampling point SM1	Dibromochloromethane 2944 EPA method 524.2	Not recorded
0.58 ug/l , sample collected Dec 9, 2024 12:30, sampling point SM1	TTHM 2950 EPA method 524.2	Oct 1, 2024 – Dec 31, 2024

Collected
Dec 9, 2025 12:30

Sampling point
SM2 Location withheld

Sample type
Routine

Lab sample
810-174683-1

Laboratory
Eurofins Eaton Analytical South Bend in
- Monochloroacetic Acid 2450 EPA method 552.2
  
  Result
  Not detected below 2 ug/l Minimum Reporting Level
  
  Monitoring period
  Not recorded
- Dichloroacetic Acid 2451 EPA method 552.2
  
  Result
  Not detected below 1 ug/l Minimum Reporting Level
  
  Monitoring period
  Not recorded
- Trichloroacetic Acid 2452 EPA method 552.2
  
  Result
  Not detected below 1 ug/l Minimum Reporting Level
  
  Monitoring period
  Not recorded
- Monobromoacetic Acid 2453 EPA method 552.2
  
  Result
  Not detected below 1 ug/l Minimum Reporting Level
  
  Monitoring period
  Not recorded
- Dibromoacetic Acid 2454 EPA method 552.2
  
  Result
  Not detected below 1 ug/l Minimum Reporting Level
  
  Monitoring period
  Not recorded
- Total Haloacetic Acids (Haa5) 2456 EPA method 552.2
  
  Result
  Not detected below 2 ug/l Minimum Reporting Level
  
  Monitoring period
  Jan 1, 2025 – Dec 31, 2025
- Chloroform 2941 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
  
  Monitoring period
  Not recorded
- Bromoform 2942 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
  
  Monitoring period
  Not recorded
- Bromodichloromethane 2943 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
  
  Monitoring period
  Not recorded
- Dibromochloromethane 2944 EPA method 524.2
  
  Result
  0.6 ug/l
  
  Monitoring period
  Not recorded
- TTHM 2950 EPA method 524.2
  
  Result
  0.6 ug/l
  
  Monitoring period
  Jan 1, 2025 – Dec 31, 2025
Collected
Oct 1, 2025 12:30

Sampling point
TF080 Treatment Plant T080

Sample type
Routine

Lab sample
CN-251002-006

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2023 – Dec 31, 2025
- Cyanide 1024 EPA method QC10204001X
  
  Result
  Not detected below 0.015 mg/l Minimum Reporting Level
Collected
Mar 26, 2025 12:10

Sampling point
TF080 Treatment Plant T080

Sample type
Routine

Lab sample
IN-250327-023

Laboratory
MSDH Lab
- Arsenic 1005 EPA method 200.8
  
  Result
  Not detected below 0.0005 mg/l Minimum Reporting Level
  
  Monitoring period
  Jan 1, 2023 – Dec 31, 2025
- Barium 1010 EPA method 200.8
  
  Result
  0.0664 mg/l
  
  Monitoring period
  Jan 1, 2023 – Dec 31, 2025
- Cadmium 1015 EPA method 200.8
  
  Result
  Not detected below 0.0005 mg/l Minimum Reporting Level
  
  Monitoring period
  Jan 1, 2023 – Dec 31, 2025
- Chromium 1020 EPA method 200.8
  
  Result
  0.0007 mg/l
  
  Monitoring period
  Jan 1, 2023 – Dec 31, 2025
- Fluoride 1025 EPA method QC 10-109-12-2-A
  
  Result
  Not detected below 0.1 mg/l Minimum Reporting Level
  
  Monitoring period
  Jan 1, 2023 – Dec 31, 2025
- Mercury 1035 EPA method 200.8
  
  Result
  Not detected below 0.0005 mg/l Minimum Reporting Level
  
  Monitoring period
  Jan 1, 2023 – Dec 31, 2025
- Nickel 1036 EPA method 200.8
  
  Result
  0.0007 mg/l
  
  Monitoring period
  Not recorded
- Selenium 1045 EPA method 200.8
  
  Result
  Not detected below 0.0025 mg/l Minimum Reporting Level
  
  Monitoring period
  Jan 1, 2023 – Dec 31, 2025
- Antimony, Total 1074 EPA method 200.8
  
  Result
  Not detected below 0.0005 mg/l Minimum Reporting Level
  
  Monitoring period
  Jan 1, 2023 – Dec 31, 2025
- Beryllium, Total 1075 EPA method 200.8
  
  Result
  Not detected below 0.0005 mg/l Minimum Reporting Level
  
  Monitoring period
  Jan 1, 2023 – Dec 31, 2025
- Thallium, Total 1085 EPA method 200.8
  
  Result
  Not detected below 0.0005 mg/l Minimum Reporting Level
  
  Monitoring period
  Jan 1, 2023 – Dec 31, 2025
Collected
Mar 26, 2025 12:30

Sampling point
TF080 Treatment Plant T080

Sample type
Routine

Lab sample
NI-250327-001

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2025 – Dec 31, 2025
- Nitrate-Nitrite 1038 EPA method QC10107041C
  
  Result
  Not detected below 0.1 mg/l Minimum Reporting Level
- Nitrate 1040 EPA method QC10107041C
  
  Result
  Not detected below 0.08 mg/l Minimum Reporting Level
- Nitrite 1041 EPA method QC10107041C
  
  Result
  Not detected below 0.02 mg/l Minimum Reporting Level
Collected
Dec 9, 2024 13:00

Sampling point
SM2 Location withheld

Sample type
Routine

Lab sample
810-130860-2

Laboratory
Eurofins Eaton Analytical South Bend in
- Monochloroacetic Acid 2450 EPA method 552.2
  
  Result
  Not detected below 2 ug/l Minimum Reporting Level
  
  Monitoring period
  Not recorded
- Dichloroacetic Acid 2451 EPA method 552.2
  
  Result
  Not detected below 1 ug/l Minimum Reporting Level
  
  Monitoring period
  Not recorded
- Trichloroacetic Acid 2452 EPA method 552.2
  
  Result
  Not detected below 1 ug/l Minimum Reporting Level
  
  Monitoring period
  Not recorded
- Monobromoacetic Acid 2453 EPA method 552.2
  
  Result
  Not detected below 1 ug/l Minimum Reporting Level
  
  Monitoring period
  Not recorded
- Dibromoacetic Acid 2454 EPA method 552.2
  
  Result
  Not detected below 1 ug/l Minimum Reporting Level
  
  Monitoring period
  Not recorded
- Total Haloacetic Acids (Haa5) 2456 EPA method 552.2
  
  Result
  Not detected below 2 ug/l Minimum Reporting Level
  
  Monitoring period
  Oct 1, 2024 – Dec 31, 2024
- Chloroform 2941 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
  
  Monitoring period
  Not recorded
- Bromoform 2942 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
  
  Monitoring period
  Not recorded
- Bromodichloromethane 2943 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
  
  Monitoring period
  Not recorded
- Dibromochloromethane 2944 EPA method 524.2
  
  Result
  0.61 ug/l
  
  Monitoring period
  Not recorded
- TTHM 2950 EPA method 524.2
  
  Result
  0.61 ug/l
  
  Monitoring period
  Oct 1, 2024 – Dec 31, 2024
Collected
Dec 9, 2024 12:30

Sampling point
SM1 Location withheld

Sample type
Routine

Lab sample
810-130860-1

Laboratory
Eurofins Eaton Analytical South Bend in
- Monochloroacetic Acid 2450 EPA method 552.2
  
  Result
  Not detected below 2 ug/l Minimum Reporting Level
  
  Monitoring period
  Not recorded
- Dichloroacetic Acid 2451 EPA method 552.2
  
  Result
  Not detected below 1 ug/l Minimum Reporting Level
  
  Monitoring period
  Not recorded
- Trichloroacetic Acid 2452 EPA method 552.2
  
  Result
  Not detected below 1 ug/l Minimum Reporting Level
  
  Monitoring period
  Not recorded
- Monobromoacetic Acid 2453 EPA method 552.2
  
  Result
  Not detected below 1 ug/l Minimum Reporting Level
  
  Monitoring period
  Not recorded
- Dibromoacetic Acid 2454 EPA method 552.2
  
  Result
  Not detected below 1 ug/l Minimum Reporting Level
  
  Monitoring period
  Not recorded
- Total Haloacetic Acids (Haa5) 2456 EPA method 552.2
  
  Result
  Not detected below 2 ug/l Minimum Reporting Level
  
  Monitoring period
  Oct 1, 2024 – Dec 31, 2024
- Chloroform 2941 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
  
  Monitoring period
  Not recorded
- Bromoform 2942 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
  
  Monitoring period
  Not recorded
- Bromodichloromethane 2943 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
  
  Monitoring period
  Not recorded
- Dibromochloromethane 2944 EPA method 524.2
  
  Result
  0.58 ug/l
  
  Monitoring period
  Not recorded
- TTHM 2950 EPA method 524.2
  
  Result
  0.58 ug/l
  
  Monitoring period
  Oct 1, 2024 – Dec 31, 2024

Routine (6).