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
MS0170019 , Walls Water Association
22 of the 58 analytes this system has been tested for have been detected at least once, across 281 samples on record.
The other 36 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 281 samples on record, detections range from September 9, 1993 to June 22, 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 | 100 of 110 results | Sep 9, 1993 | Sep 23, 2025 |
| Lead 1030 | Inorganic Chemical | 47 of 110 results | Sep 9, 1993 | Sep 23, 2025 |
| TTHM 2950 | Organic Chemical | 20 of 22 results | May 19, 2004 | Jan 22, 2026 |
| Barium 1010 | Inorganic Chemical | 16 of 16 results | May 14, 2002 | Feb 4, 2025 |
| Fluoride 1025 | Inorganic Chemical | 14 of 17 results | May 14, 2002 | Jun 22, 2026 |
| Chloroform 2941 | Organic Chemical | 14 of 16 results | Jul 11, 2007 | Jan 22, 2026 |
| Bromodichloromethane 2943 | Organic Chemical | 14 of 16 results | Jul 11, 2007 | Jan 22, 2026 |
| Total Haloacetic Acids (Haa5) 2456 | Organic Chemical | 13 of 23 results | Jul 11, 2007 | Feb 24, 2025 |
| Dibromochloromethane 2944 | Organic Chemical | 9 of 16 results | Jul 11, 2007 | Jan 22, 2026 |
| Chromium 1020 | Inorganic Chemical | 8 of 16 results | Mar 2, 2005 | Feb 4, 2025 |
| Dichloroacetic Acid 2451 | Organic Chemical | 6 of 16 results | Jul 12, 2012 | Feb 15, 2024 |
| Trichloroacetic Acid 2452 | Organic Chemical | 6 of 16 results | Jul 12, 2012 | Feb 15, 2024 |
| Nickel 1036 | Inorganic Chemical | 6 of 16 results | Jan 25, 2006 | Apr 14, 2014 |
| Gross Alpha, Incl. Radon & U 4002 | Radionuclide | 5 of 10 results | Mar 7, 2012 | Oct 4, 2012 |
| Xylenes, Total 2955 | Organic Chemical | 5 of 44 results | Oct 12, 2004 | Jul 29, 2008 |
| Sodium 1052 | Inorganic Chemical | 3 of 3 results | Sep 17, 2019 | Oct 15, 2024 |
| Selenium 1045 | Inorganic Chemical | 3 of 16 results | Mar 2, 2005 | Nov 5, 2008 |
| Cadmium 1015 | Inorganic Chemical | 2 of 16 results | Mar 2, 2005 | Jan 25, 2006 |
| Sulfate 1055 | Inorganic Chemical | 2 of 2 results | May 14, 2002 | Jan 26, 2004 |
| Nitrite 1041 | Inorganic Chemical | 1 of 35 results | Jan 10, 2022 | Jan 10, 2022 |
| Monobromoacetic Acid 2453 | Organic Chemical | 1 of 16 results | Jul 24, 2018 | Jul 24, 2018 |
| Arsenic 1005 | Inorganic Chemical | 1 of 16 results | Jan 25, 2006 | Jan 25, 2006 |
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 271–280 of 281 samples, newest first — collected September 9, 1993 to June 15, 1994. The summary above covers all 281.
20 results from the 10 samples listed here: 10 detected, 10 not detected. Across the whole record it is 296 of 1,687. 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 |
|---|---|---|
|
||
| Not detected below 0.02 mg/l Method Detection Limit , sample collected Jun 15, 1994, sampling point DS000 | Copper, Free 1022 | Not recorded |
| Not detected below 0.001 mg/l Method Detection Limit , sample collected Jun 15, 1994, sampling point DS000 | Lead 1030 | Not recorded |
|
||
| 0.456 mg/l , sample collected Sep 9, 1993, sampling point DS000 | Copper, Free 1022 | Not recorded |
| Not detected below 0.001 mg/l Method Detection Limit , sample collected Sep 9, 1993, sampling point DS000 | Lead 1030 | Not recorded |
|
||
| 0.456 mg/l , sample collected Sep 9, 1993, sampling point DS000 | Copper, Free 1022 | Not recorded |
| Not detected below 0.001 mg/l Method Detection Limit , sample collected Sep 9, 1993, sampling point DS000 | Lead 1030 | Not recorded |
|
||
| 0.367 mg/l , sample collected Sep 9, 1993, sampling point DS000 | Copper, Free 1022 | Not recorded |
| 0.001 mg/l , sample collected Sep 9, 1993, sampling point DS000 | Lead 1030 | Not recorded |
|
||
| 0.193 mg/l , sample collected Sep 9, 1993, sampling point DS000 | Copper, Free 1022 | Not recorded |
| Not detected below 0.001 mg/l Method Detection Limit , sample collected Sep 9, 1993, sampling point DS000 | Lead 1030 | Not recorded |
|
||
| 0.349 mg/l , sample collected Sep 9, 1993, sampling point DS000 | Copper, Free 1022 | Not recorded |
| 0.584 mg/l , sample collected Sep 9, 1993, sampling point DS000 | Lead 1030 | Not recorded |
|
||
| 0.254 mg/l , sample collected Sep 9, 1993, sampling point DS000 | Copper, Free 1022 | Not recorded |
| Not detected below 0.001 mg/l Method Detection Limit , sample collected Sep 9, 1993, sampling point DS000 | Lead 1030 | Not recorded |
|
||
| 0.436 mg/l , sample collected Sep 9, 1993, sampling point DS000 | Copper, Free 1022 | Not recorded |
| Not detected below 0.001 mg/l Method Detection Limit , sample collected Sep 9, 1993, sampling point DS000 | Lead 1030 | Not recorded |
|
||
| 0.225 mg/l , sample collected Sep 9, 1993, sampling point DS000 | Copper, Free 1022 | Not recorded |
| Not detected below 0.001 mg/l Method Detection Limit , sample collected Sep 9, 1993, sampling point DS000 | Lead 1030 | Not recorded |
|
||
| Not detected below 0.02 mg/l Method Detection Limit , sample collected Sep 9, 1993, sampling point DS000 | Copper, Free 1022 | Not recorded |
| Not detected below 0.001 mg/l Method Detection Limit , sample collected Sep 9, 1993, sampling point DS000 | Lead 1030 | Not recorded |
-
- Collected
- Jun 15, 1994
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 940616-021L
- Laboratory
- MSDH Lab
- Monitoring period
- Not recorded
-
Copper, Free 1022
- Result
- Not detected below 0.02 mg/l Method Detection Limit
-
Lead 1030
- Result
- Not detected below 0.001 mg/l Method Detection Limit
-
- Collected
- Sep 9, 1993
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 930910-250L
- Laboratory
- MSDH Lab
- Monitoring period
- Not recorded
-
Copper, Free 1022
- Result
- 0.456 mg/l
-
Lead 1030
- Result
- Not detected below 0.001 mg/l Method Detection Limit
-
- Collected
- Sep 9, 1993
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 930910-249L
- Laboratory
- MSDH Lab
- Monitoring period
- Not recorded
-
Copper, Free 1022
- Result
- 0.456 mg/l
-
Lead 1030
- Result
- Not detected below 0.001 mg/l Method Detection Limit
-
- Collected
- Sep 9, 1993
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 930910-246L
- Laboratory
- MSDH Lab
- Monitoring period
- Not recorded
-
Copper, Free 1022
- Result
- 0.367 mg/l
-
Lead 1030
- Result
- 0.001 mg/l
-
- Collected
- Sep 9, 1993
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 930910-242L
- Laboratory
- MSDH Lab
- Monitoring period
- Not recorded
-
Copper, Free 1022
- Result
- 0.193 mg/l
-
Lead 1030
- Result
- Not detected below 0.001 mg/l Method Detection Limit
-
- Collected
- Sep 9, 1993
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 930910-241L
- Laboratory
- MSDH Lab
- Monitoring period
- Not recorded
-
Copper, Free 1022
- Result
- 0.349 mg/l
-
Lead 1030
- Result
- 0.584 mg/l
-
- Collected
- Sep 9, 1993
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 930910-239L
- Laboratory
- MSDH Lab
- Monitoring period
- Not recorded
-
Copper, Free 1022
- Result
- 0.254 mg/l
-
Lead 1030
- Result
- Not detected below 0.001 mg/l Method Detection Limit
-
- Collected
- Sep 9, 1993
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 930910-238L
- Laboratory
- MSDH Lab
- Monitoring period
- Not recorded
-
Copper, Free 1022
- Result
- 0.436 mg/l
-
Lead 1030
- Result
- Not detected below 0.001 mg/l Method Detection Limit
-
- Collected
- Sep 9, 1993
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 930910-234L
- Laboratory
- MSDH Lab
- Monitoring period
- Not recorded
-
Copper, Free 1022
- Result
- 0.225 mg/l
-
Lead 1030
- Result
- Not detected below 0.001 mg/l Method Detection Limit
-
- Collected
- Sep 9, 1993
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 930910-231L
- Laboratory
- MSDH Lab
- Monitoring period
- Not recorded
-
Copper, Free 1022
- Result
- Not detected below 0.02 mg/l Method Detection Limit
-
Lead 1030
- Result
- Not detected below 0.001 mg/l Method Detection Limit
Routine (10).