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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

MS0690053 , Hidden Valley Light Assn

27 of the 61 analytes this system has been tested for have been detected at least once, across 123 samples on record.

The other 34 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 123 samples on record, detections range from June 15, 2011 to March 31, 2025. 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.

Every analyte ever detected for Hidden Valley Light Assn, 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 55 of 55 results Jun 15, 2011 Aug 3, 2023
Lead 1030 Inorganic Chemical 48 of 55 results Jun 15, 2011 Aug 3, 2023
Barium 1010 Inorganic Chemical 5 of 5 results May 20, 2013 Mar 31, 2025
Mercury 1035 Inorganic Chemical 5 of 5 results May 20, 2013 Mar 31, 2025
Nickel 1036 Inorganic Chemical 5 of 5 results May 20, 2013 Mar 31, 2025
Gross Alpha, Incl. Radon & U 4002 Radionuclide 5 of 5 results Dec 12, 2011 Jul 17, 2012
Combined Radium (-226 & -228) 4010 Radionuclide 5 of 5 results Dec 12, 2011 Jul 17, 2012
Radium-226 4020 Radionuclide 5 of 5 results Dec 12, 2011 Jul 17, 2012
Chromium 1020 Inorganic Chemical 4 of 5 results May 20, 2013 Mar 31, 2025
Sodium 1052 Inorganic Chemical 3 of 3 results Sep 24, 2019 Nov 13, 2023
Fluoride 1025 Inorganic Chemical 2 of 6 results May 19, 2021 Mar 31, 2025
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 2 of 6 results Aug 8, 2011 Feb 26, 2025
TTHM 2950 Organic Chemical 2 of 6 results Aug 8, 2011 Feb 26, 2025
Nitrate-Nitrite 1038 Inorganic Chemical 1 of 15 results Oct 31, 2023 Oct 31, 2023
Nitrate 1040 Inorganic Chemical 1 of 15 results Oct 31, 2023 Oct 31, 2023
Calcium 1016 Inorganic Chemical 1 of 1 result May 19, 2021 May 19, 2021
Chloride 1017 Inorganic Chemical 1 of 1 result May 19, 2021 May 19, 2021
Sulfate 1055 Inorganic Chemical 1 of 1 result May 19, 2021 May 19, 2021
Conductivity @ 25 C Umhos/CM 1064 Water Quality 1 of 1 result May 19, 2021 May 19, 2021
Alkalinity, Total 1927 Water Quality 1 of 1 result May 19, 2021 May 19, 2021
Dichloroacetic Acid 2451 Organic Chemical 1 of 4 results Aug 8, 2011 Aug 8, 2011
Trichloroacetic Acid 2452 Organic Chemical 1 of 4 results Aug 8, 2011 Aug 8, 2011
Dibromoacetic Acid 2454 Organic Chemical 1 of 4 results Aug 8, 2011 Aug 8, 2011
Chloroform 2941 Organic Chemical 1 of 4 results Aug 8, 2011 Aug 8, 2011
Bromoform 2942 Organic Chemical 1 of 4 results Aug 8, 2011 Aug 8, 2011
Bromodichloromethane 2943 Organic Chemical 1 of 4 results Aug 8, 2011 Aug 8, 2011
Dibromochloromethane 2944 Organic Chemical 1 of 4 results Aug 8, 2011 Aug 8, 2011

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 1–10 of 123 samples, newest first — collected August 3, 2023 to November 18, 2025. The summary above covers all 123.

28 results from the 10 samples listed here: 13 detected, 15 not detected. Across the whole record it is 160 of 695. 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 Hidden Valley Light Assn, every result from 1 to 10 of 123 samples shown, 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
Nov 18, 2025 13:07
Sampling point
TF080 TF080
Sample type
Routine
Lab sample
CN-251119-004
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Nov 18, 2025 13:07, sampling point TF080 Cyanide 1024 EPA method QC10204001X Jan 1, 2023 – Dec 31, 2025
Collected
Apr 14, 2025 12:40
Sampling point
TF080 TF080
Sample type
Routine
Lab sample
NI-250415-002
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 14, 2025 12:40, 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 Apr 14, 2025 12:40, 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 Apr 14, 2025 12:40, sampling point TF080 Nitrite 1041 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Collected
Mar 31, 2025 12:40
Sampling point
TF080 TF080
Sample type
Routine
Lab sample
IN-250401-022
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 31, 2025 12:40, sampling point TF080 Arsenic 1005 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0491 mg/l , sample collected Mar 31, 2025 12:40, 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 Mar 31, 2025 12:40, sampling point TF080 Cadmium 1015 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0011 mg/l , sample collected Mar 31, 2025 12:40, sampling point TF080 Chromium 1020 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.12 mg/l , sample collected Mar 31, 2025 12:40, sampling point TF080 Fluoride 1025 EPA method QC 10-109-12-2-A Jan 1, 2023 – Dec 31, 2025
0.0009 mg/l , sample collected Mar 31, 2025 12:40, sampling point TF080 Mercury 1035 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0018 mg/l , sample collected Mar 31, 2025 12:40, sampling point TF080 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Mar 31, 2025 12:40, 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 Mar 31, 2025 12:40, 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 Mar 31, 2025 12:40, 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 Mar 31, 2025 12:40, sampling point TF080 Thallium, Total 1085 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Feb 26, 2025 14:00
Sampling point
SMD Location withheld
Sample type
Routine
Lab sample
TH-250227-015
Laboratory
MSDH Lab
5.68 ug/l , sample collected Feb 26, 2025 14:00, sampling point SMD TTHM 2950 EPA method 524.2 Jan 1, 2023 – Dec 31, 2025
Collected
Feb 26, 2025 13:55
Sampling point
SMD Location withheld
Sample type
Routine
Lab sample
HA-250227-015
Laboratory
MSDH Lab
14.5 ug/l , sample collected Feb 26, 2025 13:55, sampling point SMD Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2023 – Dec 31, 2025
Collected
Apr 15, 2024 10:38
Sampling point
TF080 TF080
Sample type
Routine
Lab sample
NI-240416-094
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 15, 2024 10:38, sampling point TF080 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Apr 15, 2024 10:38, sampling point TF080 Nitrate 1040 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Apr 15, 2024 10:38, sampling point TF080 Nitrite 1041 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Collected
Nov 13, 2023 13:25
Sampling point
TF080 TF080
Sample type
Routine
Lab sample
NA-231114-017
Laboratory
MSDH Lab
12 mg/l , sample collected Nov 13, 2023 13:25, sampling point TF080 Sodium 1052 EPA method 200.7 Not recorded
Collected
Oct 31, 2023 14:00
Sampling point
TF080 TF080
Sample type
Routine
Lab sample
NI-231101-020
Laboratory
MSDH Lab
0.102 mg/l , sample collected Oct 31, 2023 14:00, sampling point TF080 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2023 – Dec 31, 2023
0.102 mg/l , sample collected Oct 31, 2023 14:00, sampling point TF080 Nitrate 1040 EPA method QC10107041C Jan 1, 2023 – Dec 31, 2023
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Oct 31, 2023 14:00, sampling point TF080 Nitrite 1041 EPA method QC10107041C Jan 1, 2023 – Dec 31, 2023
Collected
Aug 3, 2023 04:30
Sampling point
LC0001 Location withheld
Sample type
Routine
Lab sample
PB-230804-045
Laboratory
MSDH Lab
0.0214 mg/l , sample collected Aug 3, 2023 04:30, sampling point LC0001 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
0.6 ug/l , sample collected Aug 3, 2023 04:30, sampling point LC0001 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Aug 3, 2023 09:00
Sampling point
LC0009 Location withheld
Sample type
Routine
Lab sample
PB-230804-043
Laboratory
MSDH Lab
0.028 mg/l , sample collected Aug 3, 2023 09:00, sampling point LC0009 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 3, 2023 09:00, sampling point LC0009 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023

Routine (10).