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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

MS0070007 , Duncan Hill Water Supply

39 of the 73 analytes this system has been tested for have been detected at least once, across 259 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 259 samples on record, detections range from September 8, 1993 to July 25, 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.

Every analyte ever detected for Duncan Hill Water Supply, 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 68 of 80 results Sep 8, 1993 Jul 25, 2026
Lead 1030 Inorganic Chemical 37 of 80 results Sep 8, 1993 Jul 25, 2026
Fluoride 1025 Inorganic Chemical 27 of 27 results Jul 2, 2002 Jan 14, 2025
Barium 1010 Inorganic Chemical 26 of 26 results Jul 2, 2002 Jan 14, 2025
Arsenic 1005 Inorganic Chemical 25 of 26 results Jul 2, 2002 Jan 14, 2025
Nickel 1036 Inorganic Chemical 21 of 26 results Jul 2, 2002 Jan 14, 2025
Selenium 1045 Inorganic Chemical 16 of 26 results Jul 2, 2002 Feb 20, 2024
Xylenes, Total 2955 Organic Chemical 15 of 32 results Jan 25, 2018 Jan 17, 2023
Chromium 1020 Inorganic Chemical 12 of 26 results Jan 21, 2004 Jan 14, 2025
TTHM 2950 Organic Chemical 7 of 8 results May 5, 2004 Sep 12, 2022
Combined Radium (-226 & -228) 4010 Radionuclide 7 of 16 results Dec 6, 2011 Jan 28, 2013
Radium-226 4020 Radionuclide 7 of 16 results Dec 6, 2011 Jan 28, 2013
Sodium 1052 Inorganic Chemical 6 of 6 results Mar 14, 2017 Oct 22, 2024
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 6 of 8 results Jun 25, 2007 Sep 12, 2022
Nitrate-Nitrite 1038 Inorganic Chemical 5 of 48 results May 5, 2004 Mar 4, 2013
Gross Alpha, Incl. Radon & U 4002 Radionuclide 5 of 12 results Dec 6, 2011 Jul 11, 2012
Radium-228 4030 Radionuclide 5 of 16 results Dec 6, 2011 Jul 11, 2012
Nitrite 1041 Inorganic Chemical 4 of 48 results Apr 9, 2007 Jan 10, 2024
Dibromoacetic Acid 2454 Organic Chemical 4 of 4 results Aug 11, 2008 Sep 6, 2017
Bromoform 2942 Organic Chemical 4 of 4 results Jun 25, 2007 Sep 6, 2017
Nitrate 1040 Inorganic Chemical 4 of 48 results May 5, 2004 Mar 4, 2013
Gross Alpha Particle Activity 4109 Radionuclide 2 of 4 results Dec 12, 2012 Jan 28, 2013
Monochloroacetic Acid 2450 Organic Chemical 1 of 4 results Sep 6, 2017 Sep 6, 2017
Calcium 1016 Inorganic Chemical 1 of 1 result Mar 14, 2017 Mar 14, 2017
Chloride 1017 Inorganic Chemical 1 of 1 result Mar 14, 2017 Mar 14, 2017
Iron 1028 Inorganic Chemical 1 of 1 result Mar 14, 2017 Mar 14, 2017
Magnesium 1031 Inorganic Chemical 1 of 1 result Mar 14, 2017 Mar 14, 2017
Manganese 1032 Inorganic Chemical 1 of 1 result Mar 14, 2017 Mar 14, 2017
Potassium 1042 Inorganic Chemical 1 of 1 result Mar 14, 2017 Mar 14, 2017
Residue, Total, Filterable 1057 Water Quality 1 of 1 result Mar 14, 2017 Mar 14, 2017
Carbon Dioxide 1901 Water Quality 1 of 1 result Mar 14, 2017 Mar 14, 2017
Color 1905 Water Quality 1 of 1 result Mar 14, 2017 Mar 14, 2017
Hardness, Total (As Caco3) 1915 Water Quality 1 of 1 result Mar 14, 2017 Mar 14, 2017
Alkalinity, Total 1927 Water Quality 1 of 1 result Mar 14, 2017 Mar 14, 2017
Iron, Field Result FEFD Inorganic Chemical 1 of 1 result Mar 14, 2017 Mar 14, 2017
Calculated Sodium NACA Water Quality 1 of 1 result Mar 14, 2017 Mar 14, 2017
PH, Field Result PHFD Water Quality 1 of 1 result Mar 14, 2017 Mar 14, 2017
Dichloroacetic Acid 2451 Organic Chemical 1 of 4 results Aug 11, 2014 Aug 11, 2014
Dibromochloromethane 2944 Organic Chemical 1 of 4 results Jul 11, 2011 Jul 11, 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 131–140 of 259 samples, newest first — collected April 19, 2012 to July 10, 2012. The summary above covers all 259.

47 results from the 10 samples listed here: 8 detected, 39 not detected. Across the whole record it is 330 of 1,445. A sample is analysed for many analytes at once, so one sample appears on as many rows as it had results.

Units in this table

Combined Uranium is recorded on this page in ug/l and mg/l. 1 mg/l = 1,000 ug/l.

Chemical and radiological sample results for Duncan Hill Water Supply, every result from 131 to 140 of 259 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
Jul 10, 2012 14:10
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
120711-067
Laboratory
Radiation Safety Engineering
17 pci/l , sample collected Jul 10, 2012 14:10, sampling point TF101 Gross Alpha, Incl. Radon & U 4002 EPA method 00-02 Not recorded
8.4 pci/l , sample collected Jul 10, 2012 14:10, sampling point TF101 Combined Radium (-226 & -228) 4010 Not recorded
7.5 pci/l , sample collected Jul 10, 2012 14:10, sampling point TF101 Radium-226 4020 EPA method 903.1 Jul 1, 2012 – Sep 30, 2012
0.9 pci/l , sample collected Jul 10, 2012 14:10, sampling point TF101 Radium-228 4030 EPA method 904.0 Jul 1, 2012 – Sep 30, 2012
Collected
Jul 10, 2012 14:33
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
120711-068RU
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jul 10, 2012 14:33, sampling point TF102 Combined Uranium 4006 EPA method 200.8 Jul 1, 2012 – Sep 30, 2012
Collected
Jul 10, 2012 14:13
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
120711-067RU
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jul 10, 2012 14:13, sampling point TF101 Combined Uranium 4006 EPA method 200.8 Jul 1, 2012 – Sep 30, 2012
Collected
Jun 26, 2012 12:31
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
120627-006VO
Laboratory
MSDH Lab
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 26, 2012 12:31, sampling point TF102 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 26, 2012 12:31, sampling point TF102 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 26, 2012 12:31, sampling point TF102 Xylenes, Total 2955 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 26, 2012 12:31, sampling point TF102 Dichloromethane 2964 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 26, 2012 12:31, sampling point TF102 O-Dichlorobenzene 2968 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 26, 2012 12:31, sampling point TF102 P-Dichlorobenzene 2969 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 26, 2012 12:31, sampling point TF102 Vinyl Chloride 2976 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 26, 2012 12:31, sampling point TF102 1,1-Dichloroethylene 2977 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 26, 2012 12:31, sampling point TF102 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 26, 2012 12:31, sampling point TF102 1,2-Dichloroethane 2980 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 26, 2012 12:31, sampling point TF102 1,1,1-Trichloroethane 2981 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 26, 2012 12:31, sampling point TF102 Carbon Tetrachloride 2982 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 26, 2012 12:31, sampling point TF102 1,2-Dichloropropane 2983 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 26, 2012 12:31, sampling point TF102 Trichloroethylene 2984 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 26, 2012 12:31, sampling point TF102 1,1,2-Trichloroethane 2985 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 26, 2012 12:31, sampling point TF102 Tetrachloroethylene 2987 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 26, 2012 12:31, sampling point TF102 Chlorobenzene 2989 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 26, 2012 12:31, sampling point TF102 Benzene 2990 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 26, 2012 12:31, sampling point TF102 Toluene 2991 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 26, 2012 12:31, sampling point TF102 Ethylbenzene 2992 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 26, 2012 12:31, sampling point TF102 Styrene 2996 EPA method 524.2 Jan 1, 2011 – Dec 31, 2016
Collected
Jun 13, 2012 12:50
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
306237005
Laboratory
Radiation Safety Engineering
Not detected below 0.31 pci/l Minimum Reporting Level , sample collected Jun 13, 2012 12:50, sampling point TF102 Gross Alpha, Incl. Radon & U 4002 EPA method 00-02 Not recorded
Not detected below 0.31 pci/l Minimum Reporting Level , sample collected Jun 13, 2012 12:50, sampling point TF102 Combined Radium (-226 & -228) 4010 Not recorded
Not detected below 0.177 pci/l Minimum Reporting Level , sample collected Jun 13, 2012 12:50, sampling point TF102 Radium-226 4020 EPA method 903.1 Apr 1, 2012 – Jun 30, 2012
Not detected below 0.31 pci/l Minimum Reporting Level , sample collected Jun 13, 2012 12:50, sampling point TF102 Radium-228 4030 EPA method 904.0 Apr 1, 2012 – Jun 30, 2012
Collected
Jun 13, 2012 12:50
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
306237005
Laboratory
Gel Laboratories
Not detected below 0.751 pci/l Minimum Reporting Level , sample collected Jun 13, 2012 12:50, sampling point TF102 Gross Alpha, Excl. Radon & U 4000 Apr 1, 2012 – Jun 30, 2012
Not detected below 0.067 ug/l Minimum Reporting Level , sample collected Jun 13, 2012 12:50, sampling point TF102 Combined Uranium 4006 EPA method 200.8 Apr 1, 2012 – Jun 30, 2012
Not detected below 0.344 pci/l Minimum Reporting Level , sample collected Jun 13, 2012 12:50, sampling point TF102 Combined Radium (-226 & -228) 4010 Not recorded
Not detected below 0.29 pci/l Minimum Reporting Level , sample collected Jun 13, 2012 12:50, sampling point TF102 Radium-226 4020 EPA method 903.1 Apr 1, 2012 – Jun 30, 2012
Not detected below 0.344 pci/l Minimum Reporting Level , sample collected Jun 13, 2012 12:50, sampling point TF102 Radium-228 4030 EPA method 904.0 Apr 1, 2012 – Jun 30, 2012
Not detected below 0.751 pci/l Minimum Reporting Level , sample collected Jun 13, 2012 12:50, sampling point TF102 Gross Alpha Particle Activity 4109 EPA method 900.0 Apr 1, 2012 – Jun 30, 2012
Collected
Apr 19, 2012 13:21
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
120420-012
Laboratory
Radiation Safety Engineering
Not detected below 0.31 pci/l Minimum Reporting Level , sample collected Apr 19, 2012 13:21, sampling point TF102 Gross Alpha, Incl. Radon & U 4002 EPA method 00-02 Not recorded
Not detected below 0.31 pci/l Minimum Reporting Level , sample collected Apr 19, 2012 13:21, sampling point TF102 Combined Radium (-226 & -228) 4010 Not recorded
Not detected below 0.177 pci/l Minimum Reporting Level , sample collected Apr 19, 2012 13:21, sampling point TF102 Radium-226 4020 EPA method 903.1 Apr 1, 2012 – Jun 30, 2012
Not detected below 0.31 pci/l Minimum Reporting Level , sample collected Apr 19, 2012 13:21, sampling point TF102 Radium-228 4030 EPA method 904.0 Apr 1, 2012 – Jun 30, 2012
Collected
Apr 19, 2012 13:05
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
120420-011
Laboratory
Radiation Safety Engineering
17 pci/l , sample collected Apr 19, 2012 13:05, sampling point TF101 Gross Alpha, Incl. Radon & U 4002 EPA method 00-02 Not recorded
8.4 pci/l , sample collected Apr 19, 2012 13:05, sampling point TF101 Combined Radium (-226 & -228) 4010 Not recorded
7.5 pci/l , sample collected Apr 19, 2012 13:05, sampling point TF101 Radium-226 4020 EPA method 903.1 Apr 1, 2012 – Jun 30, 2012
0.9 pci/l , sample collected Apr 19, 2012 13:05, sampling point TF101 Radium-228 4030 EPA method 904.0 Apr 1, 2012 – Jun 30, 2012
Collected
Apr 19, 2012 13:23
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
120420-012RU
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 19, 2012 13:23, sampling point TF102 Combined Uranium 4006 EPA method 200.8 Apr 1, 2012 – Jun 30, 2012
Collected
Apr 19, 2012 13:08
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
120420-011RU
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 19, 2012 13:08, sampling point TF101 Combined Uranium 4006 EPA method 200.8 Apr 1, 2012 – Jun 30, 2012

Routine (10).