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.
| 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 31–40 of 268 samples, newest first — collected August 29, 2022 to August 29, 2023. The summary above covers all 268.
31 results from the 10 samples listed here: 11 detected, 20 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.
We withheld the location of 5 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.
| Result | Analyte | Monitoring period |
|---|---|---|
|
||
| 0.147 mg/l , sample collected Aug 29, 2023 05:00, sampling point LC0001 | Copper, Free 1022 EPA method 200.8 | Jan 1, 2021 – Dec 31, 2023 |
| Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 29, 2023 05:00, sampling point LC0001 | Lead 1030 EPA method 200.8 | Jan 1, 2021 – Dec 31, 2023 |
|
||
| 0.163 mg/l , sample collected Aug 29, 2023 06:02, sampling point LC0003 | Copper, Free 1022 EPA method 200.8 | Jan 1, 2021 – Dec 31, 2023 |
| 0.7 ug/l , sample collected Aug 29, 2023 06:02, sampling point LC0003 | Lead 1030 EPA method 200.8 | Jan 1, 2021 – Dec 31, 2023 |
|
||
| 0.0709 mg/l , sample collected Aug 28, 2023 16:45, sampling point DS000 | Copper, Free 1022 EPA method 200.8 | Jan 1, 2021 – Dec 31, 2023 |
| 2.3 ug/l , sample collected Aug 28, 2023 16:45, sampling point DS000 | Lead 1030 EPA method 200.8 | Jan 1, 2021 – Dec 31, 2023 |
|
||
| 0.162 mg/l , sample collected Aug 28, 2023 17:00, sampling point LC0021 | Copper, Free 1022 EPA method 200.8 | Jan 1, 2021 – Dec 31, 2023 |
| Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 28, 2023 17:00, sampling point LC0021 | Lead 1030 EPA method 200.8 | Jan 1, 2021 – Dec 31, 2023 |
|
||
| 0.114 mg/l , sample collected Aug 28, 2023 17:21, sampling point LC0019 | Copper, Free 1022 EPA method 200.8 | Jan 1, 2021 – Dec 31, 2023 |
| 1.2 ug/l , sample collected Aug 28, 2023 17:21, sampling point LC0019 | Lead 1030 EPA method 200.8 | Jan 1, 2021 – Dec 31, 2023 |
|
||
| 30.6 ug/l , sample collected Jun 7, 2023 14:52, sampling point SMD | Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 | Not recorded |
|
||
| Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 28, 2023 13:05, sampling point TF104 | Nitrate-Nitrite 1038 EPA method QC10107041C | Jan 1, 2023 – Dec 31, 2023 |
| Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 28, 2023 13:05, sampling point TF104 | Nitrate 1040 EPA method QC10107041C | Jan 1, 2023 – Dec 31, 2023 |
| Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 28, 2023 13:05, sampling point TF104 | Nitrite 1041 EPA method QC10107041C | Jan 1, 2023 – Dec 31, 2023 |
|
||
| Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 28, 2023 12:40, sampling point TF103 | Nitrate-Nitrite 1038 EPA method QC10107041C | Jan 1, 2023 – Dec 31, 2023 |
| Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 28, 2023 12:40, sampling point TF103 | Nitrate 1040 EPA method QC10107041C | Jan 1, 2023 – Dec 31, 2023 |
| Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 28, 2023 12:40, sampling point TF103 | Nitrite 1041 EPA method QC10107041C | Jan 1, 2023 – Dec 31, 2023 |
|
||
| Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 28, 2023 12:25, sampling point TF101 | Nitrate-Nitrite 1038 EPA method QC10107041C | Jan 1, 2023 – Dec 31, 2023 |
| Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 28, 2023 12:25, sampling point TF101 | Nitrate 1040 EPA method QC10107041C | Jan 1, 2023 – Dec 31, 2023 |
| Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 28, 2023 12:25, sampling point TF101 | Nitrite 1041 EPA method QC10107041C | Jan 1, 2023 – Dec 31, 2023 |
|
||
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Aug 29, 2022 12:55, sampling point TF104 | Arsenic 1005 EPA method 200.8 | Jan 1, 2020 – Dec 31, 2022 |
| 0.0031 mg/l , sample collected Aug 29, 2022 12:55, sampling point TF104 | Barium 1010 EPA method 200.8 | Jan 1, 2020 – Dec 31, 2022 |
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Aug 29, 2022 12:55, sampling point TF104 | Cadmium 1015 EPA method 200.8 | Jan 1, 2020 – Dec 31, 2022 |
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Aug 29, 2022 12:55, sampling point TF104 | Chromium 1020 EPA method 200.8 | Jan 1, 2020 – Dec 31, 2022 |
| 0.164 mg/l , sample collected Aug 29, 2022 12:55, sampling point TF104 | Fluoride 1025 EPA method QC 10-109-12-2-A | Jan 1, 2020 – Dec 31, 2022 |
| Not detected below 0.2 ug/l Minimum Reporting Level , sample collected Aug 29, 2022 12:55, sampling point TF104 | Mercury 1035 EPA method 245.1 | Jan 1, 2020 – Dec 31, 2022 |
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Aug 29, 2022 12:55, sampling point TF104 | Nickel 1036 EPA method 200.8 | Not recorded |
| Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Aug 29, 2022 12:55, sampling point TF104 | Selenium 1045 EPA method 200.8 | Jan 1, 2020 – Dec 31, 2022 |
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Aug 29, 2022 12:55, sampling point TF104 | Antimony, Total 1074 EPA method 200.8 | Jan 1, 2020 – Dec 31, 2022 |
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Aug 29, 2022 12:55, sampling point TF104 | Beryllium, Total 1075 EPA method 200.8 | Jan 1, 2020 – Dec 31, 2022 |
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Aug 29, 2022 12:55, sampling point TF104 | Thallium, Total 1085 EPA method 200.8 | Jan 1, 2020 – Dec 31, 2022 |
-
- Collected
- Aug 29, 2023 05:00
- Sampling point
- LC0001 Location withheld
- Sample type
- Routine
- Lab sample
- PB-230831-074
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2021 – Dec 31, 2023
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.147 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.5 ug/l Minimum Reporting Level
-
- Collected
- Aug 29, 2023 06:02
- Sampling point
- LC0003 Location withheld
- Sample type
- Routine
- Lab sample
- PB-230831-073
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2021 – Dec 31, 2023
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.163 mg/l
-
Lead 1030 EPA method 200.8
- Result
- 0.7 ug/l
-
- Collected
- Aug 28, 2023 16:45
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- PB-230831-072
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2021 – Dec 31, 2023
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0709 mg/l
-
Lead 1030 EPA method 200.8
- Result
- 2.3 ug/l
-
- Collected
- Aug 28, 2023 17:00
- Sampling point
- LC0021 Location withheld
- Sample type
- Routine
- Lab sample
- PB-230831-071
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2021 – Dec 31, 2023
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.162 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.5 ug/l Minimum Reporting Level
-
- Collected
- Aug 28, 2023 17:21
- Sampling point
- LC0019 Location withheld
- Sample type
- Routine
- Lab sample
- PB-230831-070
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2021 – Dec 31, 2023
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.114 mg/l
-
Lead 1030 EPA method 200.8
- Result
- 1.2 ug/l
-
- Collected
- Jun 7, 2023 14:52
- Sampling point
- SMD Location withheld
- Sample type
- Routine
- Lab sample
- HA-230608-003
- Laboratory
- MSDH Lab
- Monitoring period
- Not recorded
-
Total Haloacetic Acids (Haa5) 2456 EPA method 552.2
- Result
- 30.6 ug/l
-
- Collected
- Feb 28, 2023 13:05
- Sampling point
- TF104 Treatment Plant T104
- Sample type
- Routine
- Lab sample
- NI-230301-074
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2023 – Dec 31, 2023
-
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
- Feb 28, 2023 12:40
- Sampling point
- TF103 Treatment Plant T103
- Sample type
- Routine
- Lab sample
- NI-230301-073
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2023 – Dec 31, 2023
-
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
- Feb 28, 2023 12:25
- Sampling point
- TF101 Treatment Plant T101
- Sample type
- Routine
- Lab sample
- NI-230301-072
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2023 – Dec 31, 2023
-
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
- Aug 29, 2022 12:55
- Sampling point
- TF104 Treatment Plant T104
- Sample type
- Routine
- Lab sample
- IN-220830-009
- Laboratory
- MSDH Lab
-
Arsenic 1005 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
- Monitoring period
- Jan 1, 2020 – Dec 31, 2022
-
Barium 1010 EPA method 200.8
- Result
- 0.0031 mg/l
- Monitoring period
- Jan 1, 2020 – Dec 31, 2022
-
Cadmium 1015 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
- Monitoring period
- Jan 1, 2020 – Dec 31, 2022
-
Chromium 1020 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
- Monitoring period
- Jan 1, 2020 – Dec 31, 2022
-
Fluoride 1025 EPA method QC 10-109-12-2-A
- Result
- 0.164 mg/l
- Monitoring period
- Jan 1, 2020 – Dec 31, 2022
-
Mercury 1035 EPA method 245.1
- Result
- Not detected below 0.2 ug/l Minimum Reporting Level
- Monitoring period
- Jan 1, 2020 – Dec 31, 2022
-
Nickel 1036 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
- 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, 2020 – Dec 31, 2022
-
Antimony, Total 1074 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
- Monitoring period
- Jan 1, 2020 – Dec 31, 2022
-
Beryllium, Total 1075 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
- Monitoring period
- Jan 1, 2020 – Dec 31, 2022
-
Thallium, Total 1085 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
- Monitoring period
- Jan 1, 2020 – Dec 31, 2022
Routine (10).