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
MS0700011 , Town of Walnut
22 of the 57 analytes this system has been tested for have been detected at least once, across 240 samples on record.
The other 35 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 240 samples on record, detections range from October 29, 2003 to July 16, 2026. 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 |
|---|---|---|---|---|
| Copper, Free 1022 | Inorganic Chemical | 93 of 93 results | Aug 11, 2004 | Aug 9, 2023 |
| Lead 1030 | Inorganic Chemical | 49 of 93 results | Aug 11, 2004 | Aug 9, 2023 |
| Barium 1010 | Inorganic Chemical | 20 of 20 results | Oct 29, 2003 | Mar 31, 2025 |
| Fluoride 1025 | Inorganic Chemical | 20 of 20 results | Oct 29, 2003 | Mar 31, 2025 |
| Nickel 1036 | Inorganic Chemical | 16 of 20 results | Mar 31, 2004 | Mar 31, 2025 |
| Chromium 1020 | Inorganic Chemical | 13 of 20 results | Oct 29, 2003 | Mar 31, 2025 |
| Gross Alpha, Incl. Radon & U 4002 | Radionuclide | 10 of 10 results | Dec 8, 2011 | Jul 13, 2012 |
| TTHM 2950 | Organic Chemical | 6 of 17 results | Dec 10, 2007 | May 14, 2025 |
| Sodium 1052 | Inorganic Chemical | 5 of 5 results | Oct 6, 2019 | Jul 16, 2026 |
| Total Haloacetic Acids (Haa5) 2456 | Organic Chemical | 5 of 18 results | Jul 15, 2010 | May 14, 2025 |
| Chloroform 2941 | Organic Chemical | 4 of 13 results | Feb 12, 2025 | May 14, 2025 |
| Bromodichloromethane 2943 | Organic Chemical | 4 of 13 results | Feb 12, 2025 | May 14, 2025 |
| Sulfate 1055 | Inorganic Chemical | 4 of 4 results | Oct 29, 2003 | Mar 31, 2004 |
| Dichloroacetic Acid 2451 | Organic Chemical | 3 of 13 results | Oct 29, 2020 | May 14, 2025 |
| Nitrite 1041 | Inorganic Chemical | 3 of 43 results | May 20, 2020 | Apr 17, 2024 |
| Trichloroacetic Acid 2452 | Organic Chemical | 2 of 13 results | May 14, 2025 | May 14, 2025 |
| Dibromochloromethane 2944 | Organic Chemical | 2 of 13 results | May 14, 2025 | May 14, 2025 |
| Vinyl Chloride 2976 | Organic Chemical | 2 of 14 results | Sep 28, 2022 | Sep 28, 2022 |
| Cadmium 1015 | Inorganic Chemical | 2 of 20 results | Apr 26, 2005 | Apr 26, 2005 |
| Selenium 1045 | Inorganic Chemical | 2 of 20 results | Apr 26, 2005 | Apr 26, 2005 |
| Monobromoacetic Acid 2453 | Organic Chemical | 1 of 13 results | Oct 29, 2020 | Oct 29, 2020 |
| Nitrate-Nitrite 1038 | Inorganic Chemical | 1 of 43 results | May 20, 2020 | May 20, 2020 |
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 121–130 of 240 samples, newest first — collected February 7, 2012 to July 12, 2012. The summary above covers all 240.
26 results from the 10 samples listed here: 4 detected, 22 not detected. Across the whole record it is 267 of 1,060. A sample is analysed for many analytes at once, so one sample appears on as many rows as it had results.
| Result | Analyte | Monitoring period |
|---|---|---|
|
||
| 0.9 pci/l , sample collected Jul 12, 2012 12:45, sampling point TF101 | Gross Alpha, Incl. Radon & U 4002 EPA method 00-02 | Not recorded |
| Not detected below 0.34 pci/l Minimum Reporting Level , sample collected Jul 12, 2012 12:45, sampling point TF101 | Combined Radium (-226 & -228) 4010 | Not recorded |
| Not detected below 0.174 pci/l Minimum Reporting Level , sample collected Jul 12, 2012 12:45, sampling point TF101 | Radium-226 4020 EPA method 903.1 | Jul 1, 2012 – Sep 30, 2012 |
| Not detected below 0.34 pci/l Minimum Reporting Level , sample collected Jul 12, 2012 12:45, sampling point TF101 | Radium-228 4030 EPA method 904.0 | Jul 1, 2012 – Sep 30, 2012 |
|
||
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jul 12, 2012 13:20, sampling point TF102 | Combined Uranium 4006 EPA method 200.8 | Jul 1, 2012 – Sep 30, 2012 |
|
||
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jul 12, 2012 12:57, sampling point TF101 | Combined Uranium 4006 EPA method 200.8 | Jul 1, 2012 – Sep 30, 2012 |
|
||
| 1.3 pci/l , sample collected Apr 17, 2012 13:01, sampling point TF102 | Gross Alpha, Incl. Radon & U 4002 EPA method 00-02 | Not recorded |
| Not detected below 0.34 pci/l Minimum Reporting Level , sample collected Apr 17, 2012 13:01, sampling point TF102 | Combined Radium (-226 & -228) 4010 | Not recorded |
| Not detected below 0.172 pci/l Minimum Reporting Level , sample collected Apr 17, 2012 13:01, sampling point TF102 | Radium-226 4020 EPA method 903.1 | Apr 1, 2012 – Jun 30, 2012 |
| Not detected below 0.34 pci/l Minimum Reporting Level , sample collected Apr 17, 2012 13:01, sampling point TF102 | Radium-228 4030 EPA method 904.0 | Apr 1, 2012 – Jun 30, 2012 |
|
||
| 0.9 pci/l , sample collected Apr 17, 2012 12:45, sampling point TF101 | Gross Alpha, Incl. Radon & U 4002 EPA method 00-02 | Not recorded |
| Not detected below 0.34 pci/l Minimum Reporting Level , sample collected Apr 17, 2012 12:45, sampling point TF101 | Combined Radium (-226 & -228) 4010 | Not recorded |
| Not detected below 0.174 pci/l Minimum Reporting Level , sample collected Apr 17, 2012 12:45, sampling point TF101 | Radium-226 4020 EPA method 903.1 | Apr 1, 2012 – Jun 30, 2012 |
| Not detected below 0.34 pci/l Minimum Reporting Level , sample collected Apr 17, 2012 12:45, sampling point TF101 | Radium-228 4030 EPA method 904.0 | Apr 1, 2012 – Jun 30, 2012 |
|
||
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 17, 2012 13:10, sampling point TF102 | Combined Uranium 4006 EPA method 200.8 | Apr 1, 2012 – Jun 30, 2012 |
|
||
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 17, 2012 12:58, sampling point TF101 | Combined Uranium 4006 EPA method 200.8 | Apr 1, 2012 – Jun 30, 2012 |
|
||
| Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 4, 2012 01:15, sampling point TF101 | Nitrate-Nitrite 1038 EPA method 353.2 | Jan 1, 2012 – Dec 31, 2012 |
| Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Apr 4, 2012 01:15, sampling point TF101 | Nitrate 1040 EPA method 353.2 | Jan 1, 2012 – Dec 31, 2012 |
| Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Apr 4, 2012 01:15, sampling point TF101 | Nitrite 1041 EPA method 353.2 | Jan 1, 2012 – Dec 31, 2012 |
|
||
| Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 4, 2012 01:30, sampling point TF102 | Nitrate-Nitrite 1038 EPA method 353.2 | Jan 1, 2012 – Dec 31, 2012 |
| Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Apr 4, 2012 01:30, sampling point TF102 | Nitrate 1040 EPA method 353.2 | Jan 1, 2012 – Dec 31, 2012 |
| Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Apr 4, 2012 01:30, sampling point TF102 | Nitrite 1041 EPA method 353.2 | Jan 1, 2012 – Dec 31, 2012 |
|
||
| 1.3 pci/l , sample collected Feb 7, 2012 13:00, sampling point TF102 | Gross Alpha, Incl. Radon & U 4002 EPA method 00-02 | Not recorded |
| Not detected below 0.34 pci/l Minimum Reporting Level , sample collected Feb 7, 2012 13:00, sampling point TF102 | Combined Radium (-226 & -228) 4010 | Not recorded |
| Not detected below 0.172 pci/l Minimum Reporting Level , sample collected Feb 7, 2012 13:00, sampling point TF102 | Radium-226 4020 EPA method 903.1 | Jan 1, 2012 – Mar 31, 2012 |
| Not detected below 0.34 pci/l Minimum Reporting Level , sample collected Feb 7, 2012 13:00, sampling point TF102 | Radium-228 4030 EPA method 904.0 | Jan 1, 2012 – Mar 31, 2012 |
-
- Collected
- Jul 12, 2012 12:45
- Sampling point
- TF101 Treatment Plant T101
- Sample type
- Routine
- Lab sample
- 120713-050
- Laboratory
- Radiation Safety Engineering
-
Gross Alpha, Incl. Radon & U 4002 EPA method 00-02
- Result
- 0.9 pci/l
- Monitoring period
- Not recorded
-
Combined Radium (-226 & -228) 4010
- Result
- Not detected below 0.34 pci/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Radium-226 4020 EPA method 903.1
- Result
- Not detected below 0.174 pci/l Minimum Reporting Level
- Monitoring period
- Jul 1, 2012 – Sep 30, 2012
-
Radium-228 4030 EPA method 904.0
- Result
- Not detected below 0.34 pci/l Minimum Reporting Level
- Monitoring period
- Jul 1, 2012 – Sep 30, 2012
-
- Collected
- Jul 12, 2012 13:20
- Sampling point
- TF102 Treatment Plant T102
- Sample type
- Routine
- Lab sample
- 120713-051RU
- Laboratory
- MSDH Lab
- Monitoring period
- Jul 1, 2012 – Sep 30, 2012
-
Combined Uranium 4006 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
-
- Collected
- Jul 12, 2012 12:57
- Sampling point
- TF101 Treatment Plant T101
- Sample type
- Routine
- Lab sample
- 120713-050RU
- Laboratory
- MSDH Lab
- Monitoring period
- Jul 1, 2012 – Sep 30, 2012
-
Combined Uranium 4006 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
-
- Collected
- Apr 17, 2012 13:01
- Sampling point
- TF102 Treatment Plant T102
- Sample type
- Routine
- Lab sample
- 120418-038
- Laboratory
- Radiation Safety Engineering
-
Gross Alpha, Incl. Radon & U 4002 EPA method 00-02
- Result
- 1.3 pci/l
- Monitoring period
- Not recorded
-
Combined Radium (-226 & -228) 4010
- Result
- Not detected below 0.34 pci/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Radium-226 4020 EPA method 903.1
- Result
- Not detected below 0.172 pci/l Minimum Reporting Level
- Monitoring period
- Apr 1, 2012 – Jun 30, 2012
-
Radium-228 4030 EPA method 904.0
- Result
- Not detected below 0.34 pci/l Minimum Reporting Level
- Monitoring period
- Apr 1, 2012 – Jun 30, 2012
-
- Collected
- Apr 17, 2012 12:45
- Sampling point
- TF101 Treatment Plant T101
- Sample type
- Routine
- Lab sample
- 120418-037
- Laboratory
- Radiation Safety Engineering
-
Gross Alpha, Incl. Radon & U 4002 EPA method 00-02
- Result
- 0.9 pci/l
- Monitoring period
- Not recorded
-
Combined Radium (-226 & -228) 4010
- Result
- Not detected below 0.34 pci/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Radium-226 4020 EPA method 903.1
- Result
- Not detected below 0.174 pci/l Minimum Reporting Level
- Monitoring period
- Apr 1, 2012 – Jun 30, 2012
-
Radium-228 4030 EPA method 904.0
- Result
- Not detected below 0.34 pci/l Minimum Reporting Level
- Monitoring period
- Apr 1, 2012 – Jun 30, 2012
-
- Collected
- Apr 17, 2012 13:10
- Sampling point
- TF102 Treatment Plant T102
- Sample type
- Routine
- Lab sample
- 120418-038RU
- Laboratory
- MSDH Lab
- Monitoring period
- Apr 1, 2012 – Jun 30, 2012
-
Combined Uranium 4006 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
-
- Collected
- Apr 17, 2012 12:58
- Sampling point
- TF101 Treatment Plant T101
- Sample type
- Routine
- Lab sample
- 120418-037RU
- Laboratory
- MSDH Lab
- Monitoring period
- Apr 1, 2012 – Jun 30, 2012
-
Combined Uranium 4006 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
-
- Collected
- Apr 4, 2012 01:15
- Sampling point
- TF101 Treatment Plant T101
- Sample type
- Routine
- Lab sample
- 120405-019NI
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2012 – Dec 31, 2012
-
Nitrate-Nitrite 1038 EPA method 353.2
- Result
- Not detected below 0.1 mg/l Minimum Reporting Level
-
Nitrate 1040 EPA method 353.2
- Result
- Not detected below 0.08 mg/l Minimum Reporting Level
-
Nitrite 1041 EPA method 353.2
- Result
- Not detected below 0.02 mg/l Minimum Reporting Level
-
- Collected
- Apr 4, 2012 01:30
- Sampling point
- TF102 Treatment Plant T102
- Sample type
- Routine
- Lab sample
- 120405-018NI
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2012 – Dec 31, 2012
-
Nitrate-Nitrite 1038 EPA method 353.2
- Result
- Not detected below 0.1 mg/l Minimum Reporting Level
-
Nitrate 1040 EPA method 353.2
- Result
- Not detected below 0.08 mg/l Minimum Reporting Level
-
Nitrite 1041 EPA method 353.2
- Result
- Not detected below 0.02 mg/l Minimum Reporting Level
-
- Collected
- Feb 7, 2012 13:00
- Sampling point
- TF102 Treatment Plant T102
- Sample type
- Routine
- Lab sample
- 120208-014
- Laboratory
- Radiation Safety Engineering
-
Gross Alpha, Incl. Radon & U 4002 EPA method 00-02
- Result
- 1.3 pci/l
- Monitoring period
- Not recorded
-
Combined Radium (-226 & -228) 4010
- Result
- Not detected below 0.34 pci/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Radium-226 4020 EPA method 903.1
- Result
- Not detected below 0.172 pci/l Minimum Reporting Level
- Monitoring period
- Jan 1, 2012 – Mar 31, 2012
-
Radium-228 4030 EPA method 904.0
- Result
- Not detected below 0.34 pci/l Minimum Reporting Level
- Monitoring period
- Jan 1, 2012 – Mar 31, 2012
Routine (10).