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 31–40 of 162 samples, newest first — collected April 14, 2021 to August 2, 2022. The summary above covers all 162.

48 results from the 10 samples listed here: 17 detected, 31 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 31 to 40 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 2, 2022 13:13 Sampling point TF080 Treatment Plant T080 Sample type Routine Lab sample VO-220803-010 Laboratory MSDH Lab
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2022 13:13, sampling point TF080	1,2,4-Trichlorobenzene 2378 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2022 13:13, sampling point TF080	Cis-1,2-Dichloroethylene 2380 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2022 13:13, sampling point TF080	Xylenes, Total 2955 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2022 13:13, sampling point TF080	Dichloromethane 2964 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2022 13:13, sampling point TF080	O-Dichlorobenzene 2968 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2022 13:13, sampling point TF080	P-Dichlorobenzene 2969 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2022 13:13, sampling point TF080	Vinyl Chloride 2976 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2022 13:13, sampling point TF080	1,1-Dichloroethylene 2977 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2022 13:13, sampling point TF080	Trans-1,2-Dichloroethylene 2979 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2022 13:13, sampling point TF080	1,2-Dichloroethane 2980 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2022 13:13, sampling point TF080	1,1,1-Trichloroethane 2981 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2022 13:13, sampling point TF080	Carbon Tetrachloride 2982 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2022 13:13, sampling point TF080	1,2-Dichloropropane 2983 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2022 13:13, sampling point TF080	Trichloroethylene 2984 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2022 13:13, sampling point TF080	1,1,2-Trichloroethane 2985 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2022 13:13, sampling point TF080	Tetrachloroethylene 2987 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2022 13:13, sampling point TF080	Chlorobenzene 2989 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2022 13:13, sampling point TF080	Benzene 2990 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2022 13:13, sampling point TF080	Toluene 2991 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2022 13:13, sampling point TF080	Ethylbenzene 2992 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 2, 2022 13:13, sampling point TF080	Styrene 2996 EPA method 524.2	Jan 1, 2017 – Dec 31, 2022
Collected Jun 15, 2022 12:20 Sampling point MRT000 Max. Res. Time Sample type Routine Lab sample HA-220616-006 Laboratory MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jun 15, 2022 12:20, sampling point MRT000	Total Haloacetic Acids (Haa5) 2456 EPA method 552.2	Not recorded
Collected Jun 15, 2022 12:15 Sampling point MRT000 Max. Res. Time Sample type Routine Lab sample TH-220616-006 Laboratory MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jun 15, 2022 12:15, sampling point MRT000	TTHM 2950 EPA method 524.2	Not recorded
Collected Apr 6, 2022 14:03 Sampling point TF080 Treatment Plant T080 Sample type Routine Lab sample NI-220407-075 Laboratory MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 6, 2022 14:03, sampling point TF080	Nitrate-Nitrite 1038 EPA method QC10107041C	Jan 1, 2022 – Dec 31, 2022
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Apr 6, 2022 14:03, sampling point TF080	Nitrate 1040 EPA method QC10107041C	Jan 1, 2022 – Dec 31, 2022
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Apr 6, 2022 14:03, sampling point TF080	Nitrite 1041 EPA method QC10107041C	Jan 1, 2022 – Dec 31, 2022
Collected Oct 12, 2021 13:30 Sampling point TF080 Treatment Plant T080 Sample type Routine Lab sample RU-211013-102 Laboratory MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 12, 2021 13:30, sampling point TF080	Combined Uranium 4006 EPA method 200.8	Jan 1, 2013 – Dec 31, 2021
Collected Oct 5, 2021 13:55 Sampling point MRT000 Max. Res. Time Sample type Routine Lab sample HA-211006-009 Laboratory MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Oct 5, 2021 13:55, sampling point MRT000	Total Haloacetic Acids (Haa5) 2456 EPA method 552.2	Not recorded
Collected Oct 5, 2021 13:55 Sampling point MRT000 Max. Res. Time Sample type Routine Lab sample TH-211006-007 Laboratory MSDH Lab
1.27 ug/l , sample collected Oct 5, 2021 13:55, sampling point MRT000	TTHM 2950 EPA method 524.2	Not recorded
Collected Jun 3, 2021 10:45 Sampling point WL002 Well W002 Sample type Routine Lab sample 7PC-210617-001 Laboratory MSDH Lab
5.51 mg/l , sample collected Jun 3, 2021 10:45, sampling point WL002	Calcium 1016 EPA method 200.7	Not recorded
3.01 mg/l , sample collected Jun 3, 2021 10:45, sampling point WL002	Chloride 1017 EPA method 300.0	Not recorded
0.033 mg/l , sample collected Jun 3, 2021 10:45, sampling point WL002	Fluoride 1025 EPA method 300.0	Not recorded
5.02 mg/l , sample collected Jun 3, 2021 10:45, sampling point WL002	Sodium 1052 EPA method 200.7	Not recorded
4.41 mg/l , sample collected Jun 3, 2021 10:45, sampling point WL002	Sulfate 1055 EPA method 300.0	Not recorded
75.3 umho/cm , sample collected Jun 3, 2021 10:45, sampling point WL002	Conductivity @ 25 C Umhos/CM 1064 EPA method 2510B	Not recorded
15 cu , sample collected Jun 3, 2021 10:45, sampling point WL002	Color 1905 EPA method 2120B	Not recorded
40.8 mg/l , sample collected Jun 3, 2021 10:45, sampling point WL002	Alkalinity, Total 1927 EPA method 2320B	Not recorded
Collected Jun 3, 2021 10:40 Sampling point WL003 Well W003 Sample type Routine Lab sample 7PC-210617-002 Laboratory MSDH Lab
4.27 mg/l , sample collected Jun 3, 2021 10:40, sampling point WL003	Calcium 1016 EPA method 200.7	Not recorded
3.24 mg/l , sample collected Jun 3, 2021 10:40, sampling point WL003	Chloride 1017 EPA method 300.0	Not recorded
0.0212 mg/l , sample collected Jun 3, 2021 10:40, sampling point WL003	Fluoride 1025 EPA method 300.0	Not recorded
4.88 mg/l , sample collected Jun 3, 2021 10:40, sampling point WL003	Sodium 1052 EPA method 200.7	Not recorded
4.13 mg/l , sample collected Jun 3, 2021 10:40, sampling point WL003	Sulfate 1055 EPA method 300.0	Not recorded
65 umho/cm , sample collected Jun 3, 2021 10:40, sampling point WL003	Conductivity @ 25 C Umhos/CM 1064 EPA method 2510B	Not recorded
15 cu , sample collected Jun 3, 2021 10:40, sampling point WL003	Color 1905 EPA method 2120B	Not recorded
23.1 mg/l , sample collected Jun 3, 2021 10:40, sampling point WL003	Alkalinity, Total 1927 EPA method 2320B	Not recorded
Collected Apr 14, 2021 12:15 Sampling point TF080 Treatment Plant T080 Sample type Routine Lab sample NI-210415-050 Laboratory MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 14, 2021 12:15, sampling point TF080	Nitrate-Nitrite 1038 EPA method QC10107041C	Jan 1, 2021 – Dec 31, 2021
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Apr 14, 2021 12:15, sampling point TF080	Nitrate 1040 EPA method QC10107041C	Jan 1, 2021 – Dec 31, 2021
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Apr 14, 2021 12:15, sampling point TF080	Nitrite 1041 EPA method QC10107041C	Jan 1, 2021 – Dec 31, 2021

Collected
Aug 2, 2022 13:13

Sampling point
TF080 Treatment Plant T080

Sample type
Routine

Lab sample
VO-220803-010

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2017 – Dec 31, 2022
- 1,2,4-Trichlorobenzene 2378 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Cis-1,2-Dichloroethylene 2380 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Xylenes, Total 2955 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Dichloromethane 2964 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- O-Dichlorobenzene 2968 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- P-Dichlorobenzene 2969 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Vinyl Chloride 2976 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- 1,1-Dichloroethylene 2977 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Trans-1,2-Dichloroethylene 2979 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- 1,2-Dichloroethane 2980 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- 1,1,1-Trichloroethane 2981 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Carbon Tetrachloride 2982 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- 1,2-Dichloropropane 2983 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Trichloroethylene 2984 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- 1,1,2-Trichloroethane 2985 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Tetrachloroethylene 2987 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Chlorobenzene 2989 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Benzene 2990 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Toluene 2991 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Ethylbenzene 2992 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Styrene 2996 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
Collected
Jun 15, 2022 12:20

Sampling point
MRT000 Max. Res. Time

Sample type
Routine

Lab sample
HA-220616-006

Laboratory
MSDH Lab

Monitoring period
Not recorded
- Total Haloacetic Acids (Haa5) 2456 EPA method 552.2
  
  Result
  Not detected below 1 ug/l Minimum Reporting Level
Collected
Jun 15, 2022 12:15

Sampling point
MRT000 Max. Res. Time

Sample type
Routine

Lab sample
TH-220616-006

Laboratory
MSDH Lab

Monitoring period
Not recorded
- TTHM 2950 EPA method 524.2
  
  Result
  Not detected below 1 ug/l Minimum Reporting Level
Collected
Apr 6, 2022 14:03

Sampling point
TF080 Treatment Plant T080

Sample type
Routine

Lab sample
NI-220407-075

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2022 – Dec 31, 2022
- 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
Oct 12, 2021 13:30

Sampling point
TF080 Treatment Plant T080

Sample type
Routine

Lab sample
RU-211013-102

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2013 – Dec 31, 2021
- Combined Uranium 4006 EPA method 200.8
  
  Result
  Not detected below 0.0005 mg/l Minimum Reporting Level
Collected
Oct 5, 2021 13:55

Sampling point
MRT000 Max. Res. Time

Sample type
Routine

Lab sample
HA-211006-009

Laboratory
MSDH Lab

Monitoring period
Not recorded
- Total Haloacetic Acids (Haa5) 2456 EPA method 552.2
  
  Result
  Not detected below 1 ug/l Minimum Reporting Level
Collected
Oct 5, 2021 13:55

Sampling point
MRT000 Max. Res. Time

Sample type
Routine

Lab sample
TH-211006-007

Laboratory
MSDH Lab

Monitoring period
Not recorded
- TTHM 2950 EPA method 524.2
  
  Result
  1.27 ug/l
Collected
Jun 3, 2021 10:45

Sampling point
WL002 Well W002

Sample type
Routine

Lab sample
7PC-210617-001

Laboratory
MSDH Lab

Monitoring period
Not recorded
- Calcium 1016 EPA method 200.7
  
  Result
  5.51 mg/l
- Chloride 1017 EPA method 300.0
  
  Result
  3.01 mg/l
- Fluoride 1025 EPA method 300.0
  
  Result
  0.033 mg/l
- Sodium 1052 EPA method 200.7
  
  Result
  5.02 mg/l
- Sulfate 1055 EPA method 300.0
  
  Result
  4.41 mg/l
- Conductivity @ 25 C Umhos/CM 1064 EPA method 2510B
  
  Result
  75.3 umho/cm
- Color 1905 EPA method 2120B
  
  Result
  15 cu
- Alkalinity, Total 1927 EPA method 2320B
  
  Result
  40.8 mg/l
Collected
Jun 3, 2021 10:40

Sampling point
WL003 Well W003

Sample type
Routine

Lab sample
7PC-210617-002

Laboratory
MSDH Lab

Monitoring period
Not recorded
- Calcium 1016 EPA method 200.7
  
  Result
  4.27 mg/l
- Chloride 1017 EPA method 300.0
  
  Result
  3.24 mg/l
- Fluoride 1025 EPA method 300.0
  
  Result
  0.0212 mg/l
- Sodium 1052 EPA method 200.7
  
  Result
  4.88 mg/l
- Sulfate 1055 EPA method 300.0
  
  Result
  4.13 mg/l
- Conductivity @ 25 C Umhos/CM 1064 EPA method 2510B
  
  Result
  65 umho/cm
- Color 1905 EPA method 2120B
  
  Result
  15 cu
- Alkalinity, Total 1927 EPA method 2320B
  
  Result
  23.1 mg/l
Collected
Apr 14, 2021 12:15

Sampling point
TF080 Treatment Plant T080

Sample type
Routine

Lab sample
NI-210415-050

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2021 – Dec 31, 2021
- 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

Routine (10).