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
MS0170043 , Walls Water Assn- Lake Forest
30 of the 61 analytes this system has been tested for have been detected at least once, across 302 samples on record.
The other 31 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 302 samples on record, detections range from September 9, 1993 to July 28, 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 | 203 of 212 results | Sep 9, 1993 | Sep 26, 2024 |
| Lead 1030 | Inorganic Chemical | 78 of 212 results | Sep 9, 1993 | Sep 26, 2024 |
| TTHM 2950 | Organic Chemical | 13 of 13 results | May 19, 2004 | Jul 28, 2026 |
| Barium 1010 | Inorganic Chemical | 11 of 11 results | May 14, 2002 | Feb 4, 2025 |
| Fluoride 1025 | Inorganic Chemical | 10 of 11 results | May 14, 2002 | Feb 4, 2025 |
| Total Haloacetic Acids (Haa5) 2456 | Organic Chemical | 9 of 12 results | Sep 18, 2008 | Mar 18, 2024 |
| Chloroform 2941 | Organic Chemical | 8 of 8 results | Sep 18, 2008 | Jul 28, 2026 |
| Bromodichloromethane 2943 | Organic Chemical | 8 of 8 results | Sep 18, 2008 | Jul 28, 2026 |
| Chromium 1020 | Inorganic Chemical | 7 of 11 results | Jan 26, 2004 | Feb 4, 2025 |
| Dichloroacetic Acid 2451 | Organic Chemical | 5 of 7 results | Sep 18, 2008 | Aug 25, 2020 |
| Gross Alpha, Incl. Radon & U 4002 | Radionuclide | 5 of 5 results | Mar 7, 2012 | Oct 4, 2012 |
| Nitrate-Nitrite 1038 | Inorganic Chemical | 4 of 23 results | Mar 21, 2016 | Feb 2, 2021 |
| Nitrate 1040 | Inorganic Chemical | 4 of 23 results | Mar 21, 2016 | Feb 2, 2021 |
| Trichloroacetic Acid 2452 | Organic Chemical | 4 of 7 results | Sep 18, 2008 | Aug 25, 2020 |
| Dibromochloromethane 2944 | Organic Chemical | 3 of 8 results | Sep 18, 2008 | Jul 28, 2026 |
| Sodium 1052 | Inorganic Chemical | 3 of 3 results | Sep 17, 2019 | Oct 15, 2024 |
| Nickel 1036 | Inorganic Chemical | 3 of 11 results | Jan 25, 2006 | Apr 14, 2014 |
| Selenium 1045 | Inorganic Chemical | 3 of 11 results | Jan 26, 2004 | Jan 25, 2006 |
| Gross Alpha, Excl. Radon & U 4000 | Radionuclide | 2 of 2 results | Sep 23, 2009 | Mar 15, 2010 |
| Gross Beta Particle Activity 4100 | Radionuclide | 2 of 2 results | Sep 23, 2009 | Mar 15, 2010 |
| Gross Alpha Particle Activity 4109 | Radionuclide | 2 of 2 results | Sep 23, 2009 | Mar 15, 2010 |
| Cadmium 1015 | Inorganic Chemical | 2 of 11 results | Mar 2, 2005 | Jan 25, 2006 |
| Sulfate 1055 | Inorganic Chemical | 2 of 2 results | May 14, 2002 | Jan 26, 2004 |
| Cyanide 1024 | Inorganic Chemical | 1 of 10 results | Aug 19, 2025 | Aug 19, 2025 |
| Nitrite 1041 | Inorganic Chemical | 1 of 23 results | Jan 10, 2022 | Jan 10, 2022 |
| Monochloroacetic Acid 2450 | Organic Chemical | 1 of 7 results | Jul 12, 2012 | Jul 12, 2012 |
| Monobromoacetic Acid 2453 | Organic Chemical | 1 of 7 results | Jul 12, 2012 | Jul 12, 2012 |
| Combined Radium (-226 & -228) 4010 | Radionuclide | 1 of 7 results | Sep 23, 2009 | Sep 23, 2009 |
| Radium-226 4020 | Radionuclide | 1 of 7 results | Sep 23, 2009 | Sep 23, 2009 |
| Radium-228 4030 | Radionuclide | 1 of 7 results | Sep 23, 2009 | Sep 23, 2009 |
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 251–260 of 302 samples, newest first — collected June 15, 1995 to June 26, 1996. The summary above covers all 302.
20 results from the 10 samples listed here: 17 detected, 3 not detected. Across the whole record it is 398 of 909. 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 |
|---|---|---|
|
||
| 0.728 mg/l , sample collected Jun 26, 1996, sampling point DS000 | Copper, Free 1022 | Not recorded |
| 0.002 mg/l , sample collected Jun 26, 1996, sampling point DS000 | Lead 1030 | Not recorded |
|
||
| 0.201 mg/l , sample collected Jun 26, 1996, sampling point DS000 | Copper, Free 1022 | Not recorded |
| 0.001 mg/l , sample collected Jun 26, 1996, sampling point DS000 | Lead 1030 | Not recorded |
|
||
| 0.124 mg/l , sample collected Jun 15, 1995, sampling point DS000 | Copper, Free 1022 | Not recorded |
| Not detected below 0.001 mg/l Method Detection Limit , sample collected Jun 15, 1995, sampling point DS000 | Lead 1030 | Not recorded |
|
||
| 0.391 mg/l , sample collected Jun 15, 1995, sampling point DS000 | Copper, Free 1022 | Not recorded |
| Not detected below 0.001 mg/l Method Detection Limit , sample collected Jun 15, 1995, sampling point DS000 | Lead 1030 | Not recorded |
|
||
| 0.779 mg/l , sample collected Jun 15, 1995, sampling point DS000 | Copper, Free 1022 | Not recorded |
| 0.004 mg/l , sample collected Jun 15, 1995, sampling point DS000 | Lead 1030 | Not recorded |
|
||
| 0.382 mg/l , sample collected Jun 15, 1995, sampling point DS000 | Copper, Free 1022 | Not recorded |
| Not detected below 0.001 mg/l Method Detection Limit , sample collected Jun 15, 1995, sampling point DS000 | Lead 1030 | Not recorded |
|
||
| 0.628 mg/l , sample collected Jun 15, 1995, sampling point DS000 | Copper, Free 1022 | Not recorded |
| 0.002 mg/l , sample collected Jun 15, 1995, sampling point DS000 | Lead 1030 | Not recorded |
|
||
| 0.861 mg/l , sample collected Jun 15, 1995, sampling point DS000 | Copper, Free 1022 | Not recorded |
| 0.001 mg/l , sample collected Jun 15, 1995, sampling point DS000 | Lead 1030 | Not recorded |
|
||
| 0.951 mg/l , sample collected Jun 15, 1995, sampling point DS000 | Copper, Free 1022 | Not recorded |
| 0.001 mg/l , sample collected Jun 15, 1995, sampling point DS000 | Lead 1030 | Not recorded |
|
||
| 0.516 mg/l , sample collected Jun 15, 1995, sampling point DS000 | Copper, Free 1022 | Not recorded |
| 0.001 mg/l , sample collected Jun 15, 1995, sampling point DS000 | Lead 1030 | Not recorded |
-
- Collected
- Jun 26, 1996
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 960627-012L
- Laboratory
- MSDH Lab
- Monitoring period
- Not recorded
-
Copper, Free 1022
- Result
- 0.728 mg/l
-
Lead 1030
- Result
- 0.002 mg/l
-
- Collected
- Jun 26, 1996
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 960627-011L
- Laboratory
- MSDH Lab
- Monitoring period
- Not recorded
-
Copper, Free 1022
- Result
- 0.201 mg/l
-
Lead 1030
- Result
- 0.001 mg/l
-
- Collected
- Jun 15, 1995
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 950616-043L
- Laboratory
- MSDH Lab
- Monitoring period
- Not recorded
-
Copper, Free 1022
- Result
- 0.124 mg/l
-
Lead 1030
- Result
- Not detected below 0.001 mg/l Method Detection Limit
-
- Collected
- Jun 15, 1995
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 950616-042L
- Laboratory
- MSDH Lab
- Monitoring period
- Not recorded
-
Copper, Free 1022
- Result
- 0.391 mg/l
-
Lead 1030
- Result
- Not detected below 0.001 mg/l Method Detection Limit
-
- Collected
- Jun 15, 1995
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 950616-041L
- Laboratory
- MSDH Lab
- Monitoring period
- Not recorded
-
Copper, Free 1022
- Result
- 0.779 mg/l
-
Lead 1030
- Result
- 0.004 mg/l
-
- Collected
- Jun 15, 1995
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 950616-040L
- Laboratory
- MSDH Lab
- Monitoring period
- Not recorded
-
Copper, Free 1022
- Result
- 0.382 mg/l
-
Lead 1030
- Result
- Not detected below 0.001 mg/l Method Detection Limit
-
- Collected
- Jun 15, 1995
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 950616-031L
- Laboratory
- MSDH Lab
- Monitoring period
- Not recorded
-
Copper, Free 1022
- Result
- 0.628 mg/l
-
Lead 1030
- Result
- 0.002 mg/l
-
- Collected
- Jun 15, 1995
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 950616-030L
- Laboratory
- MSDH Lab
- Monitoring period
- Not recorded
-
Copper, Free 1022
- Result
- 0.861 mg/l
-
Lead 1030
- Result
- 0.001 mg/l
-
- Collected
- Jun 15, 1995
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 950616-029L
- Laboratory
- MSDH Lab
- Monitoring period
- Not recorded
-
Copper, Free 1022
- Result
- 0.951 mg/l
-
Lead 1030
- Result
- 0.001 mg/l
-
- Collected
- Jun 15, 1995
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 950616-028L
- Laboratory
- MSDH Lab
- Monitoring period
- Not recorded
-
Copper, Free 1022
- Result
- 0.516 mg/l
-
Lead 1030
- Result
- 0.001 mg/l
Routine (10).