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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

MS0630002 , Town of Cary

38 of the 72 analytes this system has been tested for have been detected at least once, across 252 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 252 samples on record, detections range from October 22, 2003 to October 15, 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 Town of Cary, 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
TTHM 2950 Organic Chemical 52 of 52 results Sep 21, 2004 Oct 15, 2025
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 50 of 51 results Sep 21, 2004 Oct 15, 2025
Chloroform 2941 Organic Chemical 29 of 29 results Aug 17, 2006 Mar 19, 2024
Copper, Free 1022 Inorganic Chemical 26 of 26 results Jul 10, 2007 Aug 26, 2020
Lead 1030 Inorganic Chemical 24 of 26 results Jul 10, 2007 Aug 26, 2020
Dichloroacetic Acid 2451 Organic Chemical 23 of 23 results Feb 26, 2008 Mar 19, 2024
Bromodichloromethane 2943 Organic Chemical 23 of 29 results Aug 17, 2006 Mar 19, 2024
Trichloroacetic Acid 2452 Organic Chemical 22 of 23 results Feb 26, 2008 Mar 19, 2024
Fluoride 1025 Inorganic Chemical 18 of 18 results Oct 22, 2003 Jul 29, 2025
Barium 1010 Inorganic Chemical 15 of 15 results Oct 22, 2003 Jul 29, 2025
Nitrite 1041 Inorganic Chemical 13 of 34 results Aug 2, 2006 Mar 29, 2022
Chromium 1020 Inorganic Chemical 10 of 15 results Oct 22, 2003 Jul 29, 2025
Dibromochloromethane 2944 Organic Chemical 10 of 29 results Dec 4, 2006 Mar 19, 2024
Gross Alpha, Incl. Radon & U 4002 Radionuclide 10 of 10 results Dec 14, 2011 Jul 18, 2012
Xylenes, Total 2955 Organic Chemical 9 of 32 results Jun 5, 2012 Mar 17, 2015
Sodium 1052 Inorganic Chemical 8 of 8 results Apr 21, 2010 Nov 7, 2023
Nickel 1036 Inorganic Chemical 7 of 15 results Apr 20, 2005 Sep 4, 2018
Monochloroacetic Acid 2450 Organic Chemical 5 of 23 results Feb 26, 2008 Mar 19, 2024
Calcium 1016 Inorganic Chemical 4 of 4 results Apr 21, 2010 Apr 14, 2015
Chloride 1017 Inorganic Chemical 4 of 4 results Apr 21, 2010 Apr 14, 2015
Manganese 1032 Inorganic Chemical 4 of 4 results Apr 21, 2010 Apr 14, 2015
Potassium 1042 Inorganic Chemical 4 of 4 results Apr 21, 2010 Apr 14, 2015
Sulfate 1055 Inorganic Chemical 4 of 5 results Apr 21, 2010 Apr 14, 2015
Residue, Total, Filterable 1057 Water Quality 4 of 4 results Apr 21, 2010 Apr 14, 2015
Alkalinity, Caco3 Stability 1067 Water Quality 4 of 4 results Apr 21, 2010 Apr 14, 2015
Color 1905 Water Quality 4 of 4 results Apr 21, 2010 Apr 14, 2015
Hardness, Total (As Caco3) 1915 Water Quality 4 of 4 results Apr 21, 2010 Apr 14, 2015
Alkalinity, Total 1927 Water Quality 4 of 4 results Apr 21, 2010 Apr 14, 2015
Calculated Sodium NACA Water Quality 4 of 4 results Apr 21, 2010 Apr 14, 2015
PH, Field Result PHFD Water Quality 4 of 4 results Apr 21, 2010 Apr 14, 2015
Ethylbenzene 2992 Organic Chemical 4 of 32 results Jun 5, 2012 Nov 4, 2013
Selenium 1045 Inorganic Chemical 3 of 15 results Mar 24, 2004 Apr 16, 2008
Arsenic 1005 Inorganic Chemical 2 of 15 results Sep 4, 2018 Jul 29, 2025
Iron, Field Result FEFD Inorganic Chemical 2 of 4 results Apr 21, 2010 Apr 14, 2015
Carbon Dioxide 1901 Water Quality 2 of 2 results Apr 21, 2010 Apr 21, 2010
Styrene 2996 Organic Chemical 1 of 32 results Jun 5, 2012 Jun 5, 2012
Monobromoacetic Acid 2453 Organic Chemical 1 of 23 results Dec 6, 2011 Dec 6, 2011
Magnesium 1031 Inorganic Chemical 1 of 4 results Apr 21, 2010 Apr 21, 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 31–40 of 252 samples, newest first — collected November 17, 2022 to May 30, 2023. The summary above covers all 252.

34 results from the 10 samples listed here: 7 detected, 27 not detected. Across the whole record it is 418 of 1,465. 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 2 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 Town of Cary, every result from 31 to 40 of 252 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
May 30, 2023 15:06
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
TH-230531-004
Laboratory
MSDH Lab
49.5 ug/l , sample collected May 30, 2023 15:06, sampling point SM1 TTHM 2950 EPA method 524.2 Apr 1, 2023 – Jun 30, 2023
Collected
May 30, 2023 15:40
Sampling point
SM2 Location withheld
Sample type
Routine
Lab sample
HA-230531-004
Laboratory
MSDH Lab
55.1 ug/l , sample collected May 30, 2023 15:40, sampling point SM2 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Apr 1, 2023 – Jun 30, 2023
Collected
May 30, 2023 15:13
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
HA-230531-003
Laboratory
MSDH Lab
56.3 ug/l , sample collected May 30, 2023 15:13, sampling point SM1 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Apr 1, 2023 – Jun 30, 2023
Collected
Mar 28, 2023 13:45
Sampling point
TF102
Sample type
Routine
Lab sample
NI-230329-011
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 28, 2023 13:45, 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 Mar 28, 2023 13:45, 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 Mar 28, 2023 13:45, sampling point TF102 Nitrite 1041 EPA method QC10107041C Jan 1, 2023 – Dec 31, 2023
Collected
Mar 28, 2023 13:40
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
NI-230329-010
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 28, 2023 13:40, sampling point TF101 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2023 – Dec 31, 2023
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Mar 28, 2023 13:40, sampling point TF101 Nitrate 1040 EPA method QC10107041C Jan 1, 2023 – Dec 31, 2023
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Mar 28, 2023 13:40, sampling point TF101 Nitrite 1041 EPA method QC10107041C Jan 1, 2023 – Dec 31, 2023
Collected
Mar 14, 2023 14:40
Sampling point
SM2 Location withheld
Sample type
Routine
Lab sample
TH-230315-002
Laboratory
MSDH Lab
23.5 ug/l , sample collected Mar 14, 2023 14:40, sampling point SM2 TTHM 2950 EPA method 524.2 Jan 1, 2023 – Mar 31, 2023
Collected
Mar 14, 2023 12:00
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
TH-230315-001
Laboratory
MSDH Lab
42.8 ug/l , sample collected Mar 14, 2023 12:00, sampling point SM1 TTHM 2950 EPA method 524.2 Jan 1, 2023 – Mar 31, 2023
Collected
Mar 14, 2023 14:20
Sampling point
SM2 Location withheld
Sample type
Routine
Lab sample
HA-230315-002
Laboratory
MSDH Lab
15.5 ug/l , sample collected Mar 14, 2023 14:20, sampling point SM2 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2023 – Mar 31, 2023
Collected
Mar 14, 2023 12:00
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
HA-230315-001
Laboratory
MSDH Lab
36.7 ug/l , sample collected Mar 14, 2023 12:00, sampling point SM1 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2023 – Mar 31, 2023
Collected
Nov 17, 2022 11:52
Sampling point
TF102
Sample type
Routine
Lab sample
VO-221118-002
Laboratory
MSDH Lab
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Nov 17, 2022 11:52, sampling point TF102 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Nov 17, 2022 11:52, sampling point TF102 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Nov 17, 2022 11:52, sampling point TF102 Xylenes, Total 2955 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Nov 17, 2022 11:52, sampling point TF102 Dichloromethane 2964 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Nov 17, 2022 11:52, sampling point TF102 O-Dichlorobenzene 2968 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Nov 17, 2022 11:52, sampling point TF102 P-Dichlorobenzene 2969 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Nov 17, 2022 11:52, sampling point TF102 Vinyl Chloride 2976 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Nov 17, 2022 11:52, sampling point TF102 1,1-Dichloroethylene 2977 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Nov 17, 2022 11:52, sampling point TF102 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Nov 17, 2022 11:52, sampling point TF102 1,2-Dichloroethane 2980 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Nov 17, 2022 11:52, sampling point TF102 1,1,1-Trichloroethane 2981 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Nov 17, 2022 11:52, sampling point TF102 Carbon Tetrachloride 2982 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Nov 17, 2022 11:52, sampling point TF102 1,2-Dichloropropane 2983 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Nov 17, 2022 11:52, sampling point TF102 Trichloroethylene 2984 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Nov 17, 2022 11:52, sampling point TF102 1,1,2-Trichloroethane 2985 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Nov 17, 2022 11:52, sampling point TF102 Tetrachloroethylene 2987 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Nov 17, 2022 11:52, sampling point TF102 Chlorobenzene 2989 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Nov 17, 2022 11:52, sampling point TF102 Benzene 2990 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Nov 17, 2022 11:52, sampling point TF102 Toluene 2991 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Nov 17, 2022 11:52, sampling point TF102 Ethylbenzene 2992 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Nov 17, 2022 11:52, sampling point TF102 Styrene 2996 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022

Routine (10).