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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; the list of samples further down is narrowed.

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.

Every analyte ever detected for Walls Water Assn- Lake Forest, with how many results found it and when it was first and last detected. Covers the whole record, not only 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

Showing samples collected between September 25, 2024 and September 25, 2026. That is this page’s default, not a limit on what the agency records.

Show every sample on record

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The most recent samples, result by result

The 10 samples collected between September 25, 2024 and September 25, 2026 are listed below, newest first.

47 results from the 10 samples listed here: 16 detected, 31 not detected. 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 3 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.

Chemical and radiological sample results for Walls Water Assn- Lake Forest, every result from the 10 samples on record, newest first. Not detected means the amount was below the level the laboratory can reliably report, which is given beside it.
Result Analyte Monitoring period
Collected
Jul 28, 2026 09:05
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
810-201948-1
Laboratory
Eurofins Eaton Analytical South Bend in
Not detected below 2 ug/l Minimum Reporting Level , sample collected Jul 28, 2026 09:05, sampling point MRT000 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 28, 2026 09:05, sampling point MRT000 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 28, 2026 09:05, sampling point MRT000 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 28, 2026 09:05, sampling point MRT000 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 28, 2026 09:05, sampling point MRT000 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
Not detected below 2 ug/l Minimum Reporting Level , sample collected Jul 28, 2026 09:05, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2026 – Dec 31, 2026
2 ug/l , sample collected Jul 28, 2026 09:05, sampling point MRT000 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 28, 2026 09:05, sampling point MRT000 Bromoform 2942 EPA method 524.2 Not recorded
1.1 ug/l , sample collected Jul 28, 2026 09:05, sampling point MRT000 Bromodichloromethane 2943 EPA method 524.2 Not recorded
0.54 ug/l , sample collected Jul 28, 2026 09:05, sampling point MRT000 Dibromochloromethane 2944 EPA method 524.2 Not recorded
3.64 ug/l , sample collected Jul 28, 2026 09:05, sampling point MRT000 TTHM 2950 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Collected
Feb 9, 2026 08:00
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
NI-260210-009
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 9, 2026 08:00, sampling point TF080 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2026 – Dec 31, 2026
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 9, 2026 08:00, sampling point TF080 Nitrate 1040 EPA method QC10107041C Jan 1, 2026 – Dec 31, 2026
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 9, 2026 08:00, sampling point TF080 Nitrite 1041 EPA method QC10107041C Jan 1, 2026 – Dec 31, 2026
Collected
Aug 19, 2025 09:20
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
CN-250820-037
Laboratory
MSDH Lab
0.0255 mg/l , sample collected Aug 19, 2025 09:20, sampling point TF080 Cyanide 1024 EPA method QC10204001X Jan 1, 2023 – Dec 31, 2025
Collected
Aug 7, 2025 10:40
Sampling point
SM3 Stage 2 DBP
Sample type
Routine
Lab sample
810-159045-1
Laboratory
Eurofins Eaton Analytical South Bend in
Not detected below 2 ug/l Minimum Reporting Level , sample collected Aug 7, 2025 10:40, sampling point SM3 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Aug 7, 2025 10:40, sampling point SM3 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Aug 7, 2025 10:40, sampling point SM3 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Aug 7, 2025 10:40, sampling point SM3 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Aug 7, 2025 10:40, sampling point SM3 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
Not detected below 2 ug/l Minimum Reporting Level , sample collected Aug 7, 2025 10:40, sampling point SM3 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Not recorded
1.2 ug/l , sample collected Aug 7, 2025 10:40, sampling point SM3 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 7, 2025 10:40, sampling point SM3 Bromoform 2942 EPA method 524.2 Not recorded
0.69 ug/l , sample collected Aug 7, 2025 10:40, sampling point SM3 Bromodichloromethane 2943 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 7, 2025 10:40, sampling point SM3 Dibromochloromethane 2944 EPA method 524.2 Not recorded
1.89 ug/l , sample collected Aug 7, 2025 10:40, sampling point SM3 TTHM 2950 EPA method 524.2 Not recorded
Collected
Feb 4, 2025 08:15
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
IN-250205-002
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 4, 2025 08:15, sampling point TF080 Arsenic 1005 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0336 mg/l , sample collected Feb 4, 2025 08:15, sampling point TF080 Barium 1010 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 4, 2025 08:15, sampling point TF080 Cadmium 1015 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0006 mg/l , sample collected Feb 4, 2025 08:15, sampling point TF080 Chromium 1020 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.922 mg/l , sample collected Feb 4, 2025 08:15, sampling point TF080 Fluoride 1025 EPA method QC 10-109-12-2-A Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 4, 2025 08:15, sampling point TF080 Mercury 1035 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 4, 2025 08:15, sampling point TF080 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Feb 4, 2025 08:15, sampling point TF080 Selenium 1045 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 4, 2025 08:15, sampling point TF080 Antimony, Total 1074 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 4, 2025 08:15, sampling point TF080 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 4, 2025 08:15, sampling point TF080 Thallium, Total 1085 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jan 28, 2025 08:15
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
NI-250129-004
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Jan 28, 2025 08:15, sampling point TF080 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Jan 28, 2025 08:15, sampling point TF080 Nitrate 1040 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Jan 28, 2025 08:15, sampling point TF080 Nitrite 1041 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Collected
Oct 15, 2024 08:33
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
NA-241016-010
Laboratory
MSDH Lab
59.5 mg/l , sample collected Oct 15, 2024 08:33, sampling point TF080 Sodium 1052 EPA method 200.7 Jan 1, 2022 – Dec 31, 2024
Collected
Sep 26, 2024 08:35
Sampling point
LC0037 Location withheld
Sample type
Routine
Lab sample
PB-240927-003
Laboratory
MSDH Lab
0.125 mg/l , sample collected Sep 26, 2024 08:35, sampling point LC0037 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
1.1 ug/l , sample collected Sep 26, 2024 08:35, sampling point LC0037 Lead 1030 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Collected
Sep 26, 2024 08:05
Sampling point
LC0031 Location withheld
Sample type
Routine
Lab sample
PB-240927-001
Laboratory
MSDH Lab
0.12 mg/l , sample collected Sep 26, 2024 08:05, sampling point LC0031 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 26, 2024 08:05, sampling point LC0031 Lead 1030 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Collected
Sep 25, 2024 08:20
Sampling point
LC0033 Location withheld
Sample type
Routine
Lab sample
PB-240927-002
Laboratory
MSDH Lab
0.333 mg/l , sample collected Sep 25, 2024 08:20, sampling point LC0033 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 25, 2024 08:20, sampling point LC0033 Lead 1030 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024

Routine (10).