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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

MS0510005 , Duffee Water Association

32 of the 72 analytes this system has been tested for have been detected at least once, across 173 samples on record.

The other 40 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 173 samples on record, detections range from October 13, 2003 to December 2, 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 Duffee Water Association, 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 66 of 66 results Jul 31, 2007 Sep 12, 2023
Lead 1030 Inorganic Chemical 18 of 66 results Jul 31, 2007 Sep 12, 2023
Barium 1010 Inorganic Chemical 10 of 10 results Oct 13, 2003 Dec 2, 2025
TTHM 2950 Organic Chemical 7 of 19 results Jul 19, 2004 Sep 9, 2025
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 7 of 20 results Jun 16, 2010 Aug 13, 2024
Chromium 1020 Inorganic Chemical 7 of 10 results Oct 13, 2003 May 8, 2019
Dichloroacetic Acid 2451 Organic Chemical 5 of 15 results Jun 10, 2019 Sep 9, 2025
Bromodichloromethane 2943 Organic Chemical 5 of 14 results Sep 24, 2007 Sep 9, 2025
Chloroform 2941 Organic Chemical 4 of 14 results Sep 24, 2007 Sep 9, 2025
Dibromochloromethane 2944 Organic Chemical 3 of 14 results Sep 24, 2007 Sep 9, 2025
Sodium 1052 Inorganic Chemical 3 of 3 results Mar 26, 2010 Feb 25, 2025
Nickel 1036 Inorganic Chemical 3 of 10 results Nov 3, 2008 May 8, 2019
Sulfate 1055 Inorganic Chemical 3 of 3 results Oct 13, 2003 Mar 26, 2010
Fluoride 1025 Inorganic Chemical 2 of 11 results Mar 26, 2010 Dec 2, 2025
Xylenes, Total 2955 Organic Chemical 2 of 22 results Aug 13, 2008 Jul 6, 2011
Trichloroacetic Acid 2452 Organic Chemical 1 of 15 results Jun 10, 2019 Jun 10, 2019
Ethylbenzene 2992 Organic Chemical 1 of 22 results Jul 6, 2011 Jul 6, 2011
Calcium 1016 Inorganic Chemical 1 of 1 result Mar 26, 2010 Mar 26, 2010
Chloride 1017 Inorganic Chemical 1 of 1 result Mar 26, 2010 Mar 26, 2010
Iron 1028 Inorganic Chemical 1 of 1 result Mar 26, 2010 Mar 26, 2010
Magnesium 1031 Inorganic Chemical 1 of 1 result Mar 26, 2010 Mar 26, 2010
Manganese 1032 Inorganic Chemical 1 of 1 result Mar 26, 2010 Mar 26, 2010
Potassium 1042 Inorganic Chemical 1 of 1 result Mar 26, 2010 Mar 26, 2010
Residue, Total, Filterable 1057 Water Quality 1 of 1 result Mar 26, 2010 Mar 26, 2010
Alkalinity, Caco3 Stability 1067 Water Quality 1 of 1 result Mar 26, 2010 Mar 26, 2010
Carbon Dioxide 1901 Water Quality 1 of 1 result Mar 26, 2010 Mar 26, 2010
Color 1905 Water Quality 1 of 1 result Mar 26, 2010 Mar 26, 2010
Hardness, Total (As Caco3) 1915 Water Quality 1 of 1 result Mar 26, 2010 Mar 26, 2010
Alkalinity, Total 1927 Water Quality 1 of 1 result Mar 26, 2010 Mar 26, 2010
Iron, Field Result FEFD Inorganic Chemical 1 of 1 result Mar 26, 2010 Mar 26, 2010
Calculated Sodium NACA Water Quality 1 of 1 result Mar 26, 2010 Mar 26, 2010
PH, Field Result PHFD Water Quality 1 of 1 result Mar 26, 2010 Mar 26, 2010

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 21–30 of 173 samples, newest first — collected January 30, 2023 to September 12, 2023. The summary above covers all 173.

18 results from the 10 samples listed here: 8 detected, 10 not detected. Across the whole record it is 162 of 1,002. 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 6 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 Duffee Water Association, every result from 21 to 30 of 173 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
Sep 12, 2023 07:00
Sampling point
LC0011 Location withheld
Sample type
Routine
Lab sample
PB-230913-134
Laboratory
MSDH Lab
0.0225 mg/l , sample collected Sep 12, 2023 07:00, sampling point LC0011 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 Sep 12, 2023 07:00, sampling point LC0011 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Sep 12, 2023 07:15
Sampling point
LC0018 Location withheld
Sample type
Routine
Lab sample
PB-230913-133
Laboratory
MSDH Lab
0.0504 mg/l , sample collected Sep 12, 2023 07:15, sampling point LC0018 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 Sep 12, 2023 07:15, sampling point LC0018 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Sep 12, 2023 06:30
Sampling point
LC0016 Location withheld
Sample type
Routine
Lab sample
PB-230913-132
Laboratory
MSDH Lab
0.188 mg/l , sample collected Sep 12, 2023 06:30, sampling point LC0016 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 Sep 12, 2023 06:30, sampling point LC0016 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Sep 12, 2023 06:30
Sampling point
LC0005 Location withheld
Sample type
Routine
Lab sample
PB-230913-131
Laboratory
MSDH Lab
0.243 mg/l , sample collected Sep 12, 2023 06:30, sampling point LC0005 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 Sep 12, 2023 06:30, sampling point LC0005 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Sep 12, 2023 07:17
Sampling point
LC0010 Location withheld
Sample type
Routine
Lab sample
PB-230913-130
Laboratory
MSDH Lab
0.417 mg/l , sample collected Sep 12, 2023 07:17, sampling point LC0010 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 Sep 12, 2023 07:17, sampling point LC0010 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Sep 12, 2023 08:00
Sampling point
LC0004 Location withheld
Sample type
Routine
Lab sample
PB-230913-129
Laboratory
MSDH Lab
0.0659 mg/l , sample collected Sep 12, 2023 08:00, sampling point LC0004 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
0.7 ug/l , sample collected Sep 12, 2023 08:00, sampling point LC0004 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Jun 19, 2023 13:00
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
TH-230620-008
Laboratory
MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jun 19, 2023 13:00, sampling point MRT000 TTHM 2950 EPA method 524.2 Not recorded
Collected
Jun 19, 2023 13:15
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
HA-230620-008
Laboratory
MSDH Lab
1.24 ug/l , sample collected Jun 19, 2023 13:15, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Not recorded
Collected
Feb 27, 2023 14:00
Sampling point
TF081
Sample type
Routine
Lab sample
NI-230228-054
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 27, 2023 14:00, sampling point TF081 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2023 – Dec 31, 2023
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 27, 2023 14:00, sampling point TF081 Nitrate 1040 EPA method QC10107041C Jan 1, 2023 – Dec 31, 2023
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 27, 2023 14:00, sampling point TF081 Nitrite 1041 EPA method QC10107041C Jan 1, 2023 – Dec 31, 2023
Collected
Jan 30, 2023 13:00
Sampling point
TF081
Sample type
Routine
Lab sample
CN-230131-001
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Jan 30, 2023 13:00, sampling point TF081 Cyanide 1024 EPA method QC10204001X Jan 1, 2023 – Dec 31, 2025

Routine (10).