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 31–40 of 259 samples, newest first — collected October 24, 2022 to September 12, 2023. The summary above covers all 259.

40 results from the 10 samples listed here: 2 detected, 38 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.

Chemical and radiological sample results for Duncan Hill Water Supply, every result from 31 to 40 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 Sep 12, 2023 15:10 Sampling point TF103 Treatment Facility TF103 Sample type Routine Lab sample NI-230913-003 Laboratory MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Sep 12, 2023 15:10, sampling point TF103	Nitrate-Nitrite 1038 EPA method QC10107041C	Jul 1, 2023 – Sep 30, 2023
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Sep 12, 2023 15:10, sampling point TF103	Nitrate 1040 EPA method QC10107041C	Jul 1, 2023 – Sep 30, 2023
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Sep 12, 2023 15:10, sampling point TF103	Nitrite 1041 EPA method QC10107041C	Jul 1, 2023 – Sep 30, 2023
Collected Jul 10, 2023 10:00 Sampling point TF103 Treatment Facility TF103 Sample type Routine Lab sample CN-230711-003 Laboratory MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Jul 10, 2023 10:00, sampling point TF103	Cyanide 1024 EPA method QC10204001X	Jul 1, 2023 – Sep 30, 2023
Collected May 15, 2023 13:49 Sampling point TF103 Treatment Facility TF103 Sample type Routine Lab sample CN-230516-007 Laboratory MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected May 15, 2023 13:49, sampling point TF103	Cyanide 1024 EPA method QC10204001X	Apr 1, 2023 – Jun 30, 2023
Collected Apr 11, 2023 09:37 Sampling point TF103 Treatment Facility TF103 Sample type Routine Lab sample NI-230412-002 Laboratory MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 11, 2023 09:37, sampling point TF103	Nitrate-Nitrite 1038 EPA method QC10107041C	Apr 1, 2023 – Jun 30, 2023
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Apr 11, 2023 09:37, sampling point TF103	Nitrate 1040 EPA method QC10107041C	Apr 1, 2023 – Jun 30, 2023
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Apr 11, 2023 09:37, sampling point TF103	Nitrite 1041 EPA method QC10107041C	Apr 1, 2023 – Jun 30, 2023
Collected Mar 13, 2023 10:37 Sampling point TF103 Treatment Facility TF103 Sample type Routine Lab sample CN-230314-004 Laboratory MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Mar 13, 2023 10:37, sampling point TF103	Cyanide 1024 EPA method QC10204001X	Jan 1, 2023 – Mar 31, 2023
Collected Jan 17, 2023 12:38 Sampling point TF103 Treatment Facility TF103 Sample type Routine Lab sample VO-230118-015 Laboratory MSDH Lab
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 17, 2023 12:38, sampling point TF103	1,2,4-Trichlorobenzene 2378 EPA method 524.2	Jan 1, 2023 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 17, 2023 12:38, sampling point TF103	Cis-1,2-Dichloroethylene 2380 EPA method 524.2	Jan 1, 2023 – Dec 31, 2023
0.894 ug/l , sample collected Jan 17, 2023 12:38, sampling point TF103	Xylenes, Total 2955 EPA method 524.2	Jan 1, 2023 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 17, 2023 12:38, sampling point TF103	Dichloromethane 2964 EPA method 524.2	Jan 1, 2023 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 17, 2023 12:38, sampling point TF103	O-Dichlorobenzene 2968 EPA method 524.2	Jan 1, 2023 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 17, 2023 12:38, sampling point TF103	P-Dichlorobenzene 2969 EPA method 524.2	Jan 1, 2023 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 17, 2023 12:38, sampling point TF103	Vinyl Chloride 2976 EPA method 524.2	Jan 1, 2023 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 17, 2023 12:38, sampling point TF103	1,1-Dichloroethylene 2977 EPA method 524.2	Jan 1, 2023 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 17, 2023 12:38, sampling point TF103	Trans-1,2-Dichloroethylene 2979 EPA method 524.2	Jan 1, 2023 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 17, 2023 12:38, sampling point TF103	1,2-Dichloroethane 2980 EPA method 524.2	Jan 1, 2023 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 17, 2023 12:38, sampling point TF103	1,1,1-Trichloroethane 2981 EPA method 524.2	Jan 1, 2023 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 17, 2023 12:38, sampling point TF103	Carbon Tetrachloride 2982 EPA method 524.2	Jan 1, 2023 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 17, 2023 12:38, sampling point TF103	1,2-Dichloropropane 2983 EPA method 524.2	Jan 1, 2023 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 17, 2023 12:38, sampling point TF103	Trichloroethylene 2984 EPA method 524.2	Jan 1, 2023 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 17, 2023 12:38, sampling point TF103	1,1,2-Trichloroethane 2985 EPA method 524.2	Jan 1, 2023 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 17, 2023 12:38, sampling point TF103	Tetrachloroethylene 2987 EPA method 524.2	Jan 1, 2023 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 17, 2023 12:38, sampling point TF103	Chlorobenzene 2989 EPA method 524.2	Jan 1, 2023 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 17, 2023 12:38, sampling point TF103	Benzene 2990 EPA method 524.2	Jan 1, 2023 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 17, 2023 12:38, sampling point TF103	Toluene 2991 EPA method 524.2	Jan 1, 2023 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 17, 2023 12:38, sampling point TF103	Ethylbenzene 2992 EPA method 524.2	Jan 1, 2023 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 17, 2023 12:38, sampling point TF103	Styrene 2996 EPA method 524.2	Jan 1, 2023 – Dec 31, 2023
Collected Jan 17, 2023 12:52 Sampling point TF102 Treatment Plant T102 Sample type Routine Lab sample NI-230118-039 Laboratory MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Jan 17, 2023 12:52, sampling point TF102	Nitrate-Nitrite 1038 EPA method QC10107041C	Jan 1, 2023 – Dec 31, 2023
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Jan 17, 2023 12:52, sampling point TF102	Nitrate 1040 EPA method QC10107041C	Jan 1, 2023 – Dec 31, 2023
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Jan 17, 2023 12:52, sampling point TF102	Nitrite 1041 EPA method QC10107041C	Jan 1, 2023 – Dec 31, 2023
Collected Jan 9, 2023 11:08 Sampling point TF103 Treatment Facility TF103 Sample type Routine Lab sample NI-230110-019 Laboratory MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Jan 9, 2023 11:08, sampling point TF103	Nitrate-Nitrite 1038 EPA method QC10107041C	Jan 1, 2023 – Mar 31, 2023
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Jan 9, 2023 11:08, sampling point TF103	Nitrate 1040 EPA method QC10107041C	Jan 1, 2023 – Mar 31, 2023
0.0416 mg/l , sample collected Jan 9, 2023 11:08, sampling point TF103	Nitrite 1041 EPA method QC10107041C	Jan 1, 2023 – Mar 31, 2023
Collected Nov 9, 2022 14:06 Sampling point TF103 Treatment Facility TF103 Sample type Routine Lab sample CN-221110-001 Laboratory MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Nov 9, 2022 14:06, sampling point TF103	Cyanide 1024 EPA method QC10204001X	Oct 1, 2022 – Dec 31, 2022
Collected Oct 24, 2022 15:07 Sampling point TF103 Treatment Facility TF103 Sample type Routine Lab sample NI-221025-007 Laboratory MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Oct 24, 2022 15:07, sampling point TF103	Nitrate-Nitrite 1038 EPA method QC10107041C	Oct 1, 2022 – Dec 31, 2022
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Oct 24, 2022 15:07, sampling point TF103	Nitrate 1040 EPA method QC10107041C	Oct 1, 2022 – Dec 31, 2022
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Oct 24, 2022 15:07, sampling point TF103	Nitrite 1041 EPA method QC10107041C	Oct 1, 2022 – Dec 31, 2022

Collected
Sep 12, 2023 15:10

Sampling point
TF103 Treatment Facility TF103

Sample type
Routine

Lab sample
NI-230913-003

Laboratory
MSDH Lab

Monitoring period
Jul 1, 2023 – Sep 30, 2023
- 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
Jul 10, 2023 10:00

Sampling point
TF103 Treatment Facility TF103

Sample type
Routine

Lab sample
CN-230711-003

Laboratory
MSDH Lab

Monitoring period
Jul 1, 2023 – Sep 30, 2023
- Cyanide 1024 EPA method QC10204001X
  
  Result
  Not detected below 0.015 mg/l Minimum Reporting Level
Collected
May 15, 2023 13:49

Sampling point
TF103 Treatment Facility TF103

Sample type
Routine

Lab sample
CN-230516-007

Laboratory
MSDH Lab

Monitoring period
Apr 1, 2023 – Jun 30, 2023
- Cyanide 1024 EPA method QC10204001X
  
  Result
  Not detected below 0.015 mg/l Minimum Reporting Level
Collected
Apr 11, 2023 09:37

Sampling point
TF103 Treatment Facility TF103

Sample type
Routine

Lab sample
NI-230412-002

Laboratory
MSDH Lab

Monitoring period
Apr 1, 2023 – Jun 30, 2023
- 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
Mar 13, 2023 10:37

Sampling point
TF103 Treatment Facility TF103

Sample type
Routine

Lab sample
CN-230314-004

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2023 – Mar 31, 2023
- Cyanide 1024 EPA method QC10204001X
  
  Result
  Not detected below 0.015 mg/l Minimum Reporting Level
Collected
Jan 17, 2023 12:38

Sampling point
TF103 Treatment Facility TF103

Sample type
Routine

Lab sample
VO-230118-015

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2023 – Dec 31, 2023
- 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
  0.894 ug/l
- 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
Jan 17, 2023 12:52

Sampling point
TF102 Treatment Plant T102

Sample type
Routine

Lab sample
NI-230118-039

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2023 – Dec 31, 2023
- 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 9, 2023 11:08

Sampling point
TF103 Treatment Facility TF103

Sample type
Routine

Lab sample
NI-230110-019

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2023 – Mar 31, 2023
- 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
  0.0416 mg/l
Collected
Nov 9, 2022 14:06

Sampling point
TF103 Treatment Facility TF103

Sample type
Routine

Lab sample
CN-221110-001

Laboratory
MSDH Lab

Monitoring period
Oct 1, 2022 – Dec 31, 2022
- Cyanide 1024 EPA method QC10204001X
  
  Result
  Not detected below 0.015 mg/l Minimum Reporting Level
Collected
Oct 24, 2022 15:07

Sampling point
TF103 Treatment Facility TF103

Sample type
Routine

Lab sample
NI-221025-007

Laboratory
MSDH Lab

Monitoring period
Oct 1, 2022 – Dec 31, 2022
- 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

Routine (10).