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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 151–160 of 268 samples, newest first — collected March 6, 2012 to May 15, 2012. The summary above covers all 268.

52 results from the 10 samples listed here: 10 detected, 42 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.

Chemical and radiological sample results for Town of Walnut Grove, every result from 151 to 160 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
May 15, 2012 14:00
Sampling point
TF104 Treatment Plant T104
Sample type
Routine
Lab sample
120516-140
Laboratory
Radiation Safety Engineering
1 pci/l , sample collected May 15, 2012 14:00, sampling point TF104 Gross Alpha, Incl. Radon & U 4002 EPA method 00-02 Not recorded
Not detected below 0.43 pci/l Minimum Reporting Level , sample collected May 15, 2012 14:00, sampling point TF104 Combined Radium (-226 & -228) 4010 Not recorded
Not detected below 0.392 pci/l Minimum Reporting Level , sample collected May 15, 2012 14:00, sampling point TF104 Radium-226 4020 EPA method 903.1 Apr 1, 2012 – Jun 30, 2012
Not detected below 0.43 pci/l Minimum Reporting Level , sample collected May 15, 2012 14:00, sampling point TF104 Radium-228 4030 EPA method 904.0 Apr 1, 2012 – Jun 30, 2012
Collected
May 15, 2012 14:03
Sampling point
TF104 Treatment Plant T104
Sample type
Routine
Lab sample
120516-140RU
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected May 15, 2012 14:03, sampling point TF104 Combined Uranium 4006 EPA method 200.8 Apr 1, 2012 – Jun 30, 2012
Collected
May 15, 2012 15:03
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
120516-010RU
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected May 15, 2012 15:03, sampling point TF103 Combined Uranium 4006 EPA method 200.8 Apr 1, 2012 – Jun 30, 2012
Collected
May 15, 2012 14:41
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
120516-009RU
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected May 15, 2012 14:41, sampling point TF101 Combined Uranium 4006 EPA method 200.8 Apr 1, 2012 – Jun 30, 2012
Collected
Apr 30, 2012 02:42
Sampling point
TF104 Treatment Plant T104
Sample type
Routine
Lab sample
120501-026IN
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 30, 2012 02:42, sampling point TF104 Arsenic 1005 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
0.00219 mg/l , sample collected Apr 30, 2012 02:42, sampling point TF104 Barium 1010 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 30, 2012 02:42, sampling point TF104 Cadmium 1015 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 30, 2012 02:42, sampling point TF104 Chromium 1020 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
0.148 mg/l , sample collected Apr 30, 2012 02:42, sampling point TF104 Fluoride 1025 EPA method 380-75WE Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 30, 2012 02:42, sampling point TF104 Mercury 1035 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 30, 2012 02:42, sampling point TF104 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Apr 30, 2012 02:42, sampling point TF104 Selenium 1045 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 30, 2012 02:42, sampling point TF104 Antimony, Total 1074 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 30, 2012 02:42, sampling point TF104 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 30, 2012 02:42, sampling point TF104 Thallium, Total 1085 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Collected
Apr 30, 2012 03:20
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
120501-025IN
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 30, 2012 03:20, sampling point TF103 Arsenic 1005 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
0.00325 mg/l , sample collected Apr 30, 2012 03:20, sampling point TF103 Barium 1010 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 30, 2012 03:20, sampling point TF103 Cadmium 1015 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 30, 2012 03:20, sampling point TF103 Chromium 1020 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
0.129 mg/l , sample collected Apr 30, 2012 03:20, sampling point TF103 Fluoride 1025 EPA method 380-75WE Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 30, 2012 03:20, sampling point TF103 Mercury 1035 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 30, 2012 03:20, sampling point TF103 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Apr 30, 2012 03:20, sampling point TF103 Selenium 1045 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 30, 2012 03:20, sampling point TF103 Antimony, Total 1074 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 30, 2012 03:20, sampling point TF103 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 30, 2012 03:20, sampling point TF103 Thallium, Total 1085 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Collected
Apr 30, 2012 03:01
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
120501-024IN
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 30, 2012 03:01, sampling point TF101 Arsenic 1005 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
0.00543 mg/l , sample collected Apr 30, 2012 03:01, sampling point TF101 Barium 1010 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 30, 2012 03:01, sampling point TF101 Cadmium 1015 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 30, 2012 03:01, sampling point TF101 Chromium 1020 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
0.128 mg/l , sample collected Apr 30, 2012 03:01, sampling point TF101 Fluoride 1025 EPA method 380-75WE Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 30, 2012 03:01, sampling point TF101 Mercury 1035 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 30, 2012 03:01, sampling point TF101 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Apr 30, 2012 03:01, sampling point TF101 Selenium 1045 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 30, 2012 03:01, sampling point TF101 Antimony, Total 1074 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 30, 2012 03:01, sampling point TF101 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 30, 2012 03:01, sampling point TF101 Thallium, Total 1085 EPA method 200.8 Jan 1, 2011 – Dec 31, 2013
Collected
Mar 6, 2012 14:42
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
120307-079
Laboratory
Radiation Safety Engineering
0.4 pci/l , sample collected Mar 6, 2012 14:42, sampling point TF101 Gross Alpha, Incl. Radon & U 4002 EPA method 00-02 Not recorded
Not detected below 0.35 pci/l Minimum Reporting Level , sample collected Mar 6, 2012 14:42, sampling point TF101 Combined Radium (-226 & -228) 4010 Not recorded
Not detected below 0.187 pci/l Minimum Reporting Level , sample collected Mar 6, 2012 14:42, sampling point TF101 Radium-226 4020 EPA method 903.1 Jan 1, 2012 – Mar 31, 2012
Not detected below 0.35 pci/l Minimum Reporting Level , sample collected Mar 6, 2012 14:42, sampling point TF101 Radium-228 4030 EPA method 904.0 Jan 1, 2012 – Mar 31, 2012
Collected
Mar 6, 2012 15:02
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
120307-080
Laboratory
Radiation Safety Engineering
0.5 pci/l , sample collected Mar 6, 2012 15:02, sampling point TF103 Gross Alpha, Incl. Radon & U 4002 EPA method 00-02 Not recorded
Not detected below 0.36 pci/l Minimum Reporting Level , sample collected Mar 6, 2012 15:02, sampling point TF103 Combined Radium (-226 & -228) 4010 Not recorded
Not detected below 0.193 pci/l Minimum Reporting Level , sample collected Mar 6, 2012 15:02, sampling point TF103 Radium-226 4020 EPA method 903.1 Jan 1, 2012 – Mar 31, 2012
Not detected below 0.36 pci/l Minimum Reporting Level , sample collected Mar 6, 2012 15:02, sampling point TF103 Radium-228 4030 EPA method 904.0 Jan 1, 2012 – Mar 31, 2012
Collected
Mar 6, 2012 14:10
Sampling point
TF104 Treatment Plant T104
Sample type
Routine
Lab sample
120307-094
Laboratory
Radiation Safety Engineering
1 pci/l , sample collected Mar 6, 2012 14:10, sampling point TF104 Gross Alpha, Incl. Radon & U 4002 EPA method 00-02 Not recorded
Not detected below 0.43 pci/l Minimum Reporting Level , sample collected Mar 6, 2012 14:10, sampling point TF104 Combined Radium (-226 & -228) 4010 Not recorded
Not detected below 0.392 pci/l Minimum Reporting Level , sample collected Mar 6, 2012 14:10, sampling point TF104 Radium-226 4020 EPA method 903.1 Jan 1, 2012 – Mar 31, 2012
Not detected below 0.43 pci/l Minimum Reporting Level , sample collected Mar 6, 2012 14:10, sampling point TF104 Radium-228 4030 EPA method 904.0 Jan 1, 2012 – Mar 31, 2012

Routine (10).