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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

MS0400011 , Town of Walnut Grove

24 of the 58 analytes this system has been tested for have been detected at least once, across 268 samples on record.

The other 34 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 268 samples on record, detections range from October 1, 2003 to November 20, 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 Town of Walnut Grove, 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
Barium 1010 Inorganic Chemical 34 of 34 results Oct 1, 2003 Apr 1, 2025
Fluoride 1025 Inorganic Chemical 33 of 34 results Oct 1, 2003 Apr 1, 2025
Copper, Free 1022 Inorganic Chemical 33 of 33 results Jul 12, 2007 Aug 29, 2023
Lead 1030 Inorganic Chemical 25 of 33 results Jul 12, 2007 Aug 29, 2023
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 19 of 21 results Aug 16, 2007 Nov 20, 2025
TTHM 2950 Organic Chemical 19 of 21 results Aug 16, 2007 Nov 20, 2025
Chromium 1020 Inorganic Chemical 19 of 34 results Oct 1, 2003 Apr 1, 2025
Chloroform 2941 Organic Chemical 15 of 16 results Aug 16, 2007 Nov 20, 2025
Gross Alpha, Incl. Radon & U 4002 Radionuclide 15 of 15 results Mar 6, 2012 Oct 5, 2012
Dichloroacetic Acid 2451 Organic Chemical 14 of 15 results Sep 30, 2009 Nov 20, 2025
Trichloroacetic Acid 2452 Organic Chemical 14 of 15 results Sep 30, 2009 Nov 20, 2025
Bromodichloromethane 2943 Organic Chemical 14 of 16 results Sep 30, 2009 Nov 20, 2025
Sodium 1052 Inorganic Chemical 9 of 9 results Sep 23, 2019 Feb 11, 2025
Sulfate 1055 Inorganic Chemical 8 of 8 results Oct 1, 2003 Mar 3, 2004
Dichloromethane 2964 Organic Chemical 4 of 25 results Aug 12, 2004 Aug 12, 2004
Nickel 1036 Inorganic Chemical 3 of 34 results Apr 20, 2015 Mar 11, 2025
Monochloroacetic Acid 2450 Organic Chemical 3 of 15 results Sep 30, 2009 Jun 10, 2024
Xylenes, Total 2955 Organic Chemical 3 of 25 results Jul 18, 2022 Jul 18, 2022
Dibromochloromethane 2944 Organic Chemical 2 of 16 results Jun 10, 2024 Aug 5, 2024
Selenium 1045 Inorganic Chemical 2 of 34 results Mar 28, 2005 Dec 12, 2005
Monobromoacetic Acid 2453 Organic Chemical 1 of 15 results Jun 10, 2024 Jun 10, 2024
Nitrite 1041 Inorganic Chemical 1 of 69 results May 7, 2007 May 7, 2007
Arsenic 1005 Inorganic Chemical 1 of 34 results Dec 12, 2005 Dec 12, 2005
Cadmium 1015 Inorganic Chemical 1 of 34 results Dec 12, 2005 Dec 12, 2005

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 268 samples, newest first — collected April 20, 2015 to February 27, 2017. The summary above covers all 268.

59 results from the 10 samples listed here: 15 detected, 44 not detected. Across the whole record it is 292 of 1,482. A sample is analysed for many analytes at once, so one sample appears on as many rows as it had results.

Units in this table

Mercury is recorded on this page in ug/l and mg/l. 1 mg/l = 1,000 ug/l.

Chemical and radiological sample results for Town of Walnut Grove, every result from 101 to 110 of 268 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
Feb 27, 2017 14:27
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
170228-040NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 27, 2017 14:27, sampling point TF101 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2017 – Dec 31, 2017
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 27, 2017 14:27, sampling point TF101 Nitrate 1040 EPA method QC10107041C Jan 1, 2017 – Dec 31, 2017
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 27, 2017 14:27, sampling point TF101 Nitrite 1041 EPA method QC10107041C Jan 1, 2017 – Dec 31, 2017
Collected
Feb 27, 2017 14:10
Sampling point
TF104 Treatment Plant T104
Sample type
Routine
Lab sample
170228-010NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 27, 2017 14:10, sampling point TF104 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2017 – Dec 31, 2017
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 27, 2017 14:10, sampling point TF104 Nitrate 1040 EPA method QC10107041C Jan 1, 2017 – Dec 31, 2017
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 27, 2017 14:10, sampling point TF104 Nitrite 1041 EPA method QC10107041C Jan 1, 2017 – Dec 31, 2017
Collected
Apr 18, 2016 14:59
Sampling point
TF104 Treatment Plant T104
Sample type
Routine
Lab sample
160419-054NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 18, 2016 14:59, sampling point TF104 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2016 – Dec 31, 2016
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Apr 18, 2016 14:59, sampling point TF104 Nitrate 1040 EPA method QC10107041C Jan 1, 2016 – Dec 31, 2016
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Apr 18, 2016 14:59, sampling point TF104 Nitrite 1041 EPA method QC10107041C Jan 1, 2016 – Dec 31, 2016
Collected
Apr 18, 2016 15:21
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
160419-052NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 18, 2016 15:21, sampling point TF101 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2016 – Dec 31, 2016
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Apr 18, 2016 15:21, sampling point TF101 Nitrate 1040 EPA method QC10107041C Jan 1, 2016 – Dec 31, 2016
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Apr 18, 2016 15:21, sampling point TF101 Nitrite 1041 EPA method QC10107041C Jan 1, 2016 – Dec 31, 2016
Collected
Apr 18, 2016 15:40
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
160419-049NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 18, 2016 15:40, sampling point TF103 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2016 – Dec 31, 2016
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Apr 18, 2016 15:40, sampling point TF103 Nitrate 1040 EPA method QC10107041C Jan 1, 2016 – Dec 31, 2016
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Apr 18, 2016 15:40, sampling point TF103 Nitrite 1041 EPA method QC10107041C Jan 1, 2016 – Dec 31, 2016
Collected
Feb 29, 2016 03:50
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
160301-036IN
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 29, 2016 03:50, sampling point TF101 Arsenic 1005 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
0.0054 mg/l , sample collected Feb 29, 2016 03:50, sampling point TF101 Barium 1010 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 29, 2016 03:50, sampling point TF101 Cadmium 1015 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 29, 2016 03:50, sampling point TF101 Chromium 1020 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
0.166 mg/l , sample collected Feb 29, 2016 03:50, sampling point TF101 Fluoride 1025 EPA method 300.0 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 29, 2016 03:50, sampling point TF101 Mercury 1035 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 29, 2016 03:50, sampling point TF101 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Feb 29, 2016 03:50, sampling point TF101 Selenium 1045 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 29, 2016 03:50, sampling point TF101 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 Feb 29, 2016 03:50, sampling point TF101 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 Feb 29, 2016 03:50, sampling point TF101 Thallium, Total 1085 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Collected
Jul 6, 2015 03:12
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
150707-014TH
Laboratory
MSDH Lab
21.3 ug/l , sample collected Jul 6, 2015 03:12, sampling point MRT000 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 6, 2015 03:12, sampling point MRT000 Bromoform 2942 EPA method 524.2 Not recorded
2.69 ug/l , sample collected Jul 6, 2015 03:12, sampling point MRT000 Bromodichloromethane 2943 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 6, 2015 03:12, sampling point MRT000 Dibromochloromethane 2944 EPA method 524.2 Not recorded
24 ug/l , sample collected Jul 6, 2015 03:12, sampling point MRT000 TTHM 2950 EPA method 524.2 Jan 1, 2014 – Dec 31, 2016
Collected
Jul 6, 2015 03:13
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
150707-012HA
Laboratory
MSDH Lab
0.003 mg/l , sample collected Jul 6, 2015 03:13, sampling point MRT000 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
0.013 mg/l , sample collected Jul 6, 2015 03:13, sampling point MRT000 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
0.018 mg/l , sample collected Jul 6, 2015 03:13, sampling point MRT000 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jul 6, 2015 03:13, sampling point MRT000 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jul 6, 2015 03:13, sampling point MRT000 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
0.034 mg/l , sample collected Jul 6, 2015 03:13, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 Jan 1, 2014 – Dec 31, 2016
Collected
Apr 20, 2015 02:40
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
150421-005IN
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 20, 2015 02:40, sampling point TF103 Arsenic 1005 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
0.0028 mg/l , sample collected Apr 20, 2015 02:40, sampling point TF103 Barium 1010 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 20, 2015 02:40, sampling point TF103 Cadmium 1015 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
0.0015 mg/l , sample collected Apr 20, 2015 02:40, sampling point TF103 Chromium 1020 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
0.144 mg/l , sample collected Apr 20, 2015 02:40, sampling point TF103 Fluoride 1025 EPA method 300.0 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 20, 2015 02:40, sampling point TF103 Mercury 1035 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 20, 2015 02:40, sampling point TF103 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Apr 20, 2015 02:40, sampling point TF103 Selenium 1045 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 20, 2015 02:40, sampling point TF103 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 Apr 20, 2015 02:40, sampling point TF103 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 Apr 20, 2015 02:40, sampling point TF103 Thallium, Total 1085 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Collected
Apr 20, 2015 03:08
Sampling point
TF104 Treatment Plant T104
Sample type
Routine
Lab sample
150421-004IN
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 20, 2015 03:08, sampling point TF104 Arsenic 1005 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
0.0032 mg/l , sample collected Apr 20, 2015 03:08, sampling point TF104 Barium 1010 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 20, 2015 03:08, sampling point TF104 Cadmium 1015 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 20, 2015 03:08, sampling point TF104 Chromium 1020 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
0.196 mg/l , sample collected Apr 20, 2015 03:08, sampling point TF104 Fluoride 1025 EPA method 300.0 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.2 ug/l Minimum Reporting Level , sample collected Apr 20, 2015 03:08, sampling point TF104 Mercury 1035 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
0.0011 mg/l , sample collected Apr 20, 2015 03:08, sampling point TF104 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Apr 20, 2015 03:08, sampling point TF104 Selenium 1045 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 20, 2015 03:08, sampling point TF104 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 Apr 20, 2015 03:08, sampling point TF104 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 Apr 20, 2015 03:08, sampling point TF104 Thallium, Total 1085 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016

Routine (10).