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 181–190 of 302 samples, newest first — collected September 18, 2008 to July 28, 2009. The summary above covers all 302.
28 results from the 10 samples listed here: 15 detected, 13 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 |
|---|---|---|
|
||
| 0.2665 mg/l , sample collected Jul 28, 2009, sampling point DS000 | Copper, Free 1022 EPA method 200.8 | Jan 1, 2008 – Dec 31, 2010 |
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jul 28, 2009, sampling point DS000 | Lead 1030 EPA method 200.8 | Jan 1, 2008 – Dec 31, 2010 |
|
||
| 0.0898 mg/l , sample collected Jul 28, 2009, sampling point DS000 | Copper, Free 1022 EPA method 200.8 | Jan 1, 2008 – Dec 31, 2010 |
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jul 28, 2009, sampling point DS000 | Lead 1030 EPA method 200.8 | Jan 1, 2008 – Dec 31, 2010 |
|
||
| 0.8914 mg/l , sample collected Jul 28, 2009, sampling point DS000 | Copper, Free 1022 EPA method 200.8 | Jan 1, 2008 – Dec 31, 2010 |
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jul 28, 2009, sampling point DS000 | Lead 1030 EPA method 200.8 | Jan 1, 2008 – Dec 31, 2010 |
|
||
| 0.7537 mg/l , sample collected Jul 27, 2009, sampling point DS000 | Copper, Free 1022 EPA method 200.8 | Jan 1, 2008 – Dec 31, 2010 |
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jul 27, 2009, sampling point DS000 | Lead 1030 EPA method 200.8 | Jan 1, 2008 – Dec 31, 2010 |
|
||
| 0.8285 mg/l , sample collected Jul 27, 2009, sampling point DS000 | Copper, Free 1022 EPA method 200.8 | Jan 1, 2008 – Dec 31, 2010 |
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jul 27, 2009, sampling point DS000 | Lead 1030 EPA method 200.8 | Jan 1, 2008 – Dec 31, 2010 |
|
||
| 0.0515 mg/l , sample collected Jul 27, 2009, sampling point DS000 | Copper, Free 1022 EPA method 200.8 | Jan 1, 2008 – Dec 31, 2010 |
| 0.0008 mg/l , sample collected Jul 27, 2009, sampling point DS000 | Lead 1030 EPA method 200.8 | Jan 1, 2008 – Dec 31, 2010 |
|
||
| 0.1253 mg/l , sample collected Jul 27, 2009, sampling point DS000 | Copper, Free 1022 EPA method 200.8 | Jan 1, 2008 – Dec 31, 2010 |
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jul 27, 2009, sampling point DS000 | Lead 1030 EPA method 200.8 | Jan 1, 2008 – Dec 31, 2010 |
|
||
| Not detected below 0.25 mg/l Minimum Reporting Level , sample collected Mar 23, 2009, sampling point TF080 | Nitrate-Nitrite 1038 EPA method 353.2 | Jan 1, 2009 – Dec 31, 2009 |
| Not detected below 0.2 mg/l Minimum Reporting Level , sample collected Mar 23, 2009, sampling point TF080 | Nitrate 1040 EPA method 353.2 | Jan 1, 2009 – Dec 31, 2009 |
| Not detected below 0.05 mg/l Minimum Reporting Level , sample collected Mar 23, 2009, sampling point TF080 | Nitrite 1041 EPA method 353.2 | Jan 1, 2009 – Dec 31, 2009 |
|
||
| 4.37 ug/l , sample collected Sep 18, 2008, sampling point MRT000 | Chloroform 2941 EPA method 524.2 | Not recorded |
| Not detected below 1 ug/l Minimum Reporting Level , sample collected Sep 18, 2008, sampling point MRT000 | Bromoform 2942 EPA method 524.2 | Not recorded |
| 2.26 ug/l , sample collected Sep 18, 2008, sampling point MRT000 | Bromodichloromethane 2943 EPA method 524.2 | Not recorded |
| 1.25 ug/l , sample collected Sep 18, 2008, sampling point MRT000 | Dibromochloromethane 2944 EPA method 524.2 | Not recorded |
| 7.88 ug/l , sample collected Sep 18, 2008, sampling point MRT000 | TTHM 2950 EPA method 524.2 | Jan 1, 2008 – Dec 31, 2010 |
|
||
| Not detected below 0.002 mg/l Minimum Reporting Level , sample collected Sep 18, 2008, sampling point MRT000 | Monochloroacetic Acid 2450 EPA method 552.2 | Not recorded |
| 0.002 mg/l , sample collected Sep 18, 2008, sampling point MRT000 | Dichloroacetic Acid 2451 EPA method 552.2 | Not recorded |
| 0.001 mg/l , sample collected Sep 18, 2008, sampling point MRT000 | Trichloroacetic Acid 2452 EPA method 552.2 | Not recorded |
| Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Sep 18, 2008, sampling point MRT000 | Monobromoacetic Acid 2453 EPA method 552.2 | Not recorded |
| Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Sep 18, 2008, sampling point MRT000 | Dibromoacetic Acid 2454 EPA method 552.2 | Not recorded |
| 0 mg/l This result is recorded as a detection, and the figure the agency wrote — "0.00" — is zero to the precision it was written to. Read the zero as "smaller than the written figure resolves", not as "none present". SDWIS holds a separate numeric concentration that Drinking Water Watch does not publish, so this endpoint does not carry it either; no more precise magnitude is available here. , sample collected Sep 18, 2008, sampling point MRT000 | Total Haloacetic Acids (Haa5) 2456 | Jan 1, 2008 – Dec 31, 2010 |
-
- Collected
- Jul 28, 2009
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 090731-034PB
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2008 – Dec 31, 2010
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.2665 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
-
- Collected
- Jul 28, 2009
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 090731-033PB
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2008 – Dec 31, 2010
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0898 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
-
- Collected
- Jul 28, 2009
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 090731-031PB
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2008 – Dec 31, 2010
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.8914 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
-
- Collected
- Jul 27, 2009
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 090731-049PB
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2008 – Dec 31, 2010
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.7537 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
-
- Collected
- Jul 27, 2009
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 090731-036PB
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2008 – Dec 31, 2010
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.8285 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
-
- Collected
- Jul 27, 2009
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 090731-032PB
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2008 – Dec 31, 2010
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0515 mg/l
-
Lead 1030 EPA method 200.8
- Result
- 0.0008 mg/l
-
- Collected
- Jul 27, 2009
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 090731-028PB
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2008 – Dec 31, 2010
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.1253 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
-
- Collected
- Mar 23, 2009
- Sampling point
- TF080 Treatment Plant T080
- Sample type
- Routine
- Lab sample
- 090324-029NI
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2009 – Dec 31, 2009
-
Nitrate-Nitrite 1038 EPA method 353.2
- Result
- Not detected below 0.25 mg/l Minimum Reporting Level
-
Nitrate 1040 EPA method 353.2
- Result
- Not detected below 0.2 mg/l Minimum Reporting Level
-
Nitrite 1041 EPA method 353.2
- Result
- Not detected below 0.05 mg/l Minimum Reporting Level
-
- Collected
- Sep 18, 2008
- Sampling point
- MRT000 Max. Res. Time
- Sample type
- Routine
- Lab sample
- 080919-015TH
- Laboratory
- MSDH Lab
-
Chloroform 2941 EPA method 524.2
- Result
- 4.37 ug/l
- Monitoring period
- Not recorded
-
Bromoform 2942 EPA method 524.2
- Result
- Not detected below 1 ug/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Bromodichloromethane 2943 EPA method 524.2
- Result
- 2.26 ug/l
- Monitoring period
- Not recorded
-
Dibromochloromethane 2944 EPA method 524.2
- Result
- 1.25 ug/l
- Monitoring period
- Not recorded
-
TTHM 2950 EPA method 524.2
- Result
- 7.88 ug/l
- Monitoring period
- Jan 1, 2008 – Dec 31, 2010
-
- Collected
- Sep 18, 2008
- Sampling point
- MRT000 Max. Res. Time
- Sample type
- Routine
- Lab sample
- 080919-010HA
- Laboratory
- MSDH Lab
-
Monochloroacetic Acid 2450 EPA method 552.2
- Result
- Not detected below 0.002 mg/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Dichloroacetic Acid 2451 EPA method 552.2
- Result
- 0.002 mg/l
- Monitoring period
- Not recorded
-
Trichloroacetic Acid 2452 EPA method 552.2
- Result
- 0.001 mg/l
- Monitoring period
- Not recorded
-
Monobromoacetic Acid 2453 EPA method 552.2
- Result
- Not detected below 0.001 mg/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Dibromoacetic Acid 2454 EPA method 552.2
- Result
- Not detected below 0.001 mg/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Total Haloacetic Acids (Haa5) 2456
- Result
- 0 mg/l This result is recorded as a detection, and the figure the agency wrote — "0.00" — is zero to the precision it was written to. Read the zero as "smaller than the written figure resolves", not as "none present". SDWIS holds a separate numeric concentration that Drinking Water Watch does not publish, so this endpoint does not carry it either; no more precise magnitude is available here.
- Monitoring period
- Jan 1, 2008 – Dec 31, 2010
Routine (10).