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; 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 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

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

Choose a date range

The most recent samples, result by result

The table below lists 11–17 of 17 samples, newest first — collected October 22, 2024 to February 10, 2025. The summary above covers all 17.

41 results from the 7 samples listed here: 6 detected, 35 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 1 sampling point 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 Duncan Hill Water Supply, every result from 11 to 17 of 17 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 Feb 10, 2025 13:18 Sampling point SMD Location withheld Sample type Routine Lab sample HA-250211-012 Laboratory MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Feb 10, 2025 13:18, sampling point SMD	Total Haloacetic Acids (Haa5) 2456 EPA method 552.2	Jan 1, 2023 – Dec 31, 2025
Collected Feb 10, 2025 12:50 Sampling point TF103 Treatment Facility TF103 Sample type Routine Lab sample VO-250211-008 Laboratory MSDH Lab
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 10, 2025 12:50, sampling point TF103	1,2,4-Trichlorobenzene 2378 EPA method 524.2	Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 10, 2025 12:50, sampling point TF103	Cis-1,2-Dichloroethylene 2380 EPA method 524.2	Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 10, 2025 12:50, sampling point TF103	Xylenes, Total 2955 EPA method 524.2	Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 10, 2025 12:50, sampling point TF103	Dichloromethane 2964 EPA method 524.2	Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 10, 2025 12:50, sampling point TF103	O-Dichlorobenzene 2968 EPA method 524.2	Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 10, 2025 12:50, sampling point TF103	P-Dichlorobenzene 2969 EPA method 524.2	Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 10, 2025 12:50, sampling point TF103	Vinyl Chloride 2976 EPA method 524.2	Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 10, 2025 12:50, sampling point TF103	1,1-Dichloroethylene 2977 EPA method 524.2	Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 10, 2025 12:50, sampling point TF103	Trans-1,2-Dichloroethylene 2979 EPA method 524.2	Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 10, 2025 12:50, sampling point TF103	1,2-Dichloroethane 2980 EPA method 524.2	Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 10, 2025 12:50, sampling point TF103	1,1,1-Trichloroethane 2981 EPA method 524.2	Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 10, 2025 12:50, sampling point TF103	Carbon Tetrachloride 2982 EPA method 524.2	Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 10, 2025 12:50, sampling point TF103	1,2-Dichloropropane 2983 EPA method 524.2	Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 10, 2025 12:50, sampling point TF103	Trichloroethylene 2984 EPA method 524.2	Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 10, 2025 12:50, sampling point TF103	1,1,2-Trichloroethane 2985 EPA method 524.2	Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 10, 2025 12:50, sampling point TF103	Tetrachloroethylene 2987 EPA method 524.2	Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 10, 2025 12:50, sampling point TF103	Chlorobenzene 2989 EPA method 524.2	Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 10, 2025 12:50, sampling point TF103	Benzene 2990 EPA method 524.2	Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 10, 2025 12:50, sampling point TF103	Toluene 2991 EPA method 524.2	Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 10, 2025 12:50, sampling point TF103	Ethylbenzene 2992 EPA method 524.2	Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 10, 2025 12:50, sampling point TF103	Styrene 2996 EPA method 524.2	Jan 1, 2025 – Dec 31, 2025
Collected Feb 10, 2025 13:12 Sampling point SMD Location withheld Sample type Routine Lab sample TH-250211-012 Laboratory MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Feb 10, 2025 13:12, sampling point SMD	TTHM 2950 EPA method 524.2	Jan 1, 2023 – Dec 31, 2025
Collected Feb 10, 2025 13:08 Sampling point TF103 Treatment Facility TF103 Sample type Routine Lab sample NI-250211-011 Laboratory MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 10, 2025 13:08, sampling point TF103	Nitrate-Nitrite 1038 EPA method QC10107041C	Jan 1, 2025 – Dec 31, 2025
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 10, 2025 13:08, sampling point TF103	Nitrate 1040 EPA method QC10107041C	Jan 1, 2025 – Dec 31, 2025
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 10, 2025 13:08, sampling point TF103	Nitrite 1041 EPA method QC10107041C	Jan 1, 2025 – Dec 31, 2025
Collected Feb 10, 2025 12:58 Sampling point TF102 Treatment Plant T102 Sample type Routine Lab sample NI-250211-010 Laboratory MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 10, 2025 12:58, sampling point TF102	Nitrate-Nitrite 1038 EPA method QC10107041C	Jan 1, 2025 – Dec 31, 2025
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 10, 2025 12:58, sampling point TF102	Nitrate 1040 EPA method QC10107041C	Jan 1, 2025 – Dec 31, 2025
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 10, 2025 12:58, sampling point TF102	Nitrite 1041 EPA method QC10107041C	Jan 1, 2025 – Dec 31, 2025
Collected Jan 14, 2025 13:45 Sampling point TF102 Treatment Plant T102 Sample type Routine Lab sample IN-250115-018 Laboratory MSDH Lab
0.005 mg/l , sample collected Jan 14, 2025 13:45, sampling point TF102	Arsenic 1005 EPA method 200.8	Jan 1, 2023 – Dec 31, 2025
0.138 mg/l , sample collected Jan 14, 2025 13:45, sampling point TF102	Barium 1010 EPA method 200.8	Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 14, 2025 13:45, sampling point TF102	Cadmium 1015 EPA method 200.8	Jan 1, 2023 – Dec 31, 2025
0.0021 mg/l , sample collected Jan 14, 2025 13:45, sampling point TF102	Chromium 1020 EPA method 200.8	Jan 1, 2023 – Dec 31, 2025
0.243 mg/l , sample collected Jan 14, 2025 13:45, sampling point TF102	Fluoride 1025 EPA method QC 10-109-12-2-A	Jan 1, 2023 – Dec 31, 2025
Not detected below 0.2 ug/l Minimum Reporting Level , sample collected Jan 14, 2025 13:45, sampling point TF102	Mercury 1035 EPA method 245.1	Jan 1, 2023 – Dec 31, 2025
0.0028 mg/l , sample collected Jan 14, 2025 13:45, sampling point TF102	Nickel 1036 EPA method 200.8	Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Jan 14, 2025 13:45, sampling point TF102	Selenium 1045 EPA method 200.8	Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 14, 2025 13:45, sampling point TF102	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 Jan 14, 2025 13:45, sampling point TF102	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 Jan 14, 2025 13:45, sampling point TF102	Thallium, Total 1085 EPA method 200.8	Jan 1, 2023 – Dec 31, 2025
Collected Oct 22, 2024 13:15 Sampling point TF102 Treatment Plant T102 Sample type Routine Lab sample NA-241023-012 Laboratory MSDH Lab
177 mg/l , sample collected Oct 22, 2024 13:15, sampling point TF102	Sodium 1052 EPA method 200.7	Jan 1, 2022 – Dec 31, 2024

Collected
Feb 10, 2025 13:18

Sampling point
SMD Location withheld

Sample type
Routine

Lab sample
HA-250211-012

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2023 – Dec 31, 2025
- Total Haloacetic Acids (Haa5) 2456 EPA method 552.2
  
  Result
  Not detected below 1 ug/l Minimum Reporting Level
Collected
Feb 10, 2025 12:50

Sampling point
TF103 Treatment Facility TF103

Sample type
Routine

Lab sample
VO-250211-008

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2025 – Dec 31, 2025
- 1,2,4-Trichlorobenzene 2378 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Cis-1,2-Dichloroethylene 2380 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Xylenes, Total 2955 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Dichloromethane 2964 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- O-Dichlorobenzene 2968 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- P-Dichlorobenzene 2969 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Vinyl Chloride 2976 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- 1,1-Dichloroethylene 2977 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Trans-1,2-Dichloroethylene 2979 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- 1,2-Dichloroethane 2980 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- 1,1,1-Trichloroethane 2981 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Carbon Tetrachloride 2982 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- 1,2-Dichloropropane 2983 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Trichloroethylene 2984 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- 1,1,2-Trichloroethane 2985 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Tetrachloroethylene 2987 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Chlorobenzene 2989 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Benzene 2990 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Toluene 2991 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Ethylbenzene 2992 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Styrene 2996 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
Collected
Feb 10, 2025 13:12

Sampling point
SMD Location withheld

Sample type
Routine

Lab sample
TH-250211-012

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2023 – Dec 31, 2025
- TTHM 2950 EPA method 524.2
  
  Result
  Not detected below 1 ug/l Minimum Reporting Level
Collected
Feb 10, 2025 13:08

Sampling point
TF103 Treatment Facility TF103

Sample type
Routine

Lab sample
NI-250211-011

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2025 – Dec 31, 2025
- Nitrate-Nitrite 1038 EPA method QC10107041C
  
  Result
  Not detected below 0.1 mg/l Minimum Reporting Level
- Nitrate 1040 EPA method QC10107041C
  
  Result
  Not detected below 0.08 mg/l Minimum Reporting Level
- Nitrite 1041 EPA method QC10107041C
  
  Result
  Not detected below 0.02 mg/l Minimum Reporting Level
Collected
Feb 10, 2025 12:58

Sampling point
TF102 Treatment Plant T102

Sample type
Routine

Lab sample
NI-250211-010

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2025 – Dec 31, 2025
- Nitrate-Nitrite 1038 EPA method QC10107041C
  
  Result
  Not detected below 0.1 mg/l Minimum Reporting Level
- Nitrate 1040 EPA method QC10107041C
  
  Result
  Not detected below 0.08 mg/l Minimum Reporting Level
- Nitrite 1041 EPA method QC10107041C
  
  Result
  Not detected below 0.02 mg/l Minimum Reporting Level
Collected
Jan 14, 2025 13:45

Sampling point
TF102 Treatment Plant T102

Sample type
Routine

Lab sample
IN-250115-018

Laboratory
MSDH Lab
- Arsenic 1005 EPA method 200.8
  
  Result
  0.005 mg/l
  
  Monitoring period
  Jan 1, 2023 – Dec 31, 2025
- Barium 1010 EPA method 200.8
  
  Result
  0.138 mg/l
  
  Monitoring period
  Jan 1, 2023 – Dec 31, 2025
- Cadmium 1015 EPA method 200.8
  
  Result
  Not detected below 0.0005 mg/l Minimum Reporting Level
  
  Monitoring period
  Jan 1, 2023 – Dec 31, 2025
- Chromium 1020 EPA method 200.8
  
  Result
  0.0021 mg/l
  
  Monitoring period
  Jan 1, 2023 – Dec 31, 2025
- Fluoride 1025 EPA method QC 10-109-12-2-A
  
  Result
  0.243 mg/l
  
  Monitoring period
  Jan 1, 2023 – Dec 31, 2025
- Mercury 1035 EPA method 245.1
  
  Result
  Not detected below 0.2 ug/l Minimum Reporting Level
  
  Monitoring period
  Jan 1, 2023 – Dec 31, 2025
- Nickel 1036 EPA method 200.8
  
  Result
  0.0028 mg/l
  
  Monitoring period
  Not recorded
- Selenium 1045 EPA method 200.8
  
  Result
  Not detected below 0.0025 mg/l Minimum Reporting Level
  
  Monitoring period
  Jan 1, 2023 – Dec 31, 2025
- Antimony, Total 1074 EPA method 200.8
  
  Result
  Not detected below 0.0005 mg/l Minimum Reporting Level
  
  Monitoring period
  Jan 1, 2023 – Dec 31, 2025
- Beryllium, Total 1075 EPA method 200.8
  
  Result
  Not detected below 0.0005 mg/l Minimum Reporting Level
  
  Monitoring period
  Jan 1, 2023 – Dec 31, 2025
- Thallium, Total 1085 EPA method 200.8
  
  Result
  Not detected below 0.0005 mg/l Minimum Reporting Level
  
  Monitoring period
  Jan 1, 2023 – Dec 31, 2025
Collected
Oct 22, 2024 13:15

Sampling point
TF102 Treatment Plant T102

Sample type
Routine

Lab sample
NA-241023-012

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2022 – Dec 31, 2024
- Sodium 1052 EPA method 200.7
  
  Result
  177 mg/l

Routine (7).