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
MS0290002 , Dorsey Water Association
11 of the 14 analytes this system has been tested for have been detected at least once, across 397 samples on record.
The other 3 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 397 samples on record, detections range from July 19, 1993 to November 3, 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.
| Analyte | Kind | Detected in | First detected | Last detected |
|---|---|---|---|---|
| Copper, Free 1022 | Inorganic Chemical | 151 of 200 results | Jul 19, 1993 | Sep 23, 2025 |
| TTHM 2950 | Organic Chemical | 100 of 100 results | Jun 7, 2004 | Nov 3, 2025 |
| Total Haloacetic Acids (Haa5) 2456 | Organic Chemical | 97 of 97 results | Aug 16, 2004 | Nov 3, 2025 |
| Chloroform 2941 | Organic Chemical | 70 of 70 results | May 15, 2006 | Nov 3, 2025 |
| Bromodichloromethane 2943 | Organic Chemical | 70 of 70 results | May 15, 2006 | Nov 3, 2025 |
| Trichloroacetic Acid 2452 | Organic Chemical | 65 of 65 results | Oct 22, 2007 | Nov 3, 2025 |
| Dichloroacetic Acid 2451 | Organic Chemical | 64 of 65 results | Oct 22, 2007 | Nov 3, 2025 |
| Monochloroacetic Acid 2450 | Organic Chemical | 37 of 65 results | Jan 22, 2008 | Jun 16, 2020 |
| Lead 1030 | Inorganic Chemical | 29 of 200 results | Jul 19, 1993 | Jun 24, 2020 |
| Dibromochloromethane 2944 | Organic Chemical | 21 of 70 results | Aug 7, 2006 | Nov 3, 2025 |
| Monobromoacetic Acid 2453 | Organic Chemical | 9 of 65 results | May 10, 2011 | Jun 16, 2020 |
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 261–270 of 397 samples, newest first — collected August 25, 2008 to November 30, 2009. The summary above covers all 397.
54 results from the 10 samples listed here: 36 detected, 18 not detected. Across the whole record it is 713 of 1,203. 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.
| Result | Analyte | Monitoring period |
|---|---|---|
|
||
| 36 ug/l , sample collected Nov 30, 2009, sampling point MRT000 | Chloroform 2941 EPA method 524.2 | Not recorded |
| Not detected below 1 ug/l Minimum Reporting Level , sample collected Nov 30, 2009, sampling point MRT000 | Bromoform 2942 EPA method 524.2 | Not recorded |
| 7.69 ug/l , sample collected Nov 30, 2009, sampling point MRT000 | Bromodichloromethane 2943 EPA method 524.2 | Not recorded |
| 1.17 ug/l , sample collected Nov 30, 2009, sampling point MRT000 | Dibromochloromethane 2944 EPA method 524.2 | Not recorded |
| 44.86 ug/l , sample collected Nov 30, 2009, sampling point MRT000 | TTHM 2950 EPA method 524.2 | Oct 1, 2009 – Dec 31, 2009 |
|
||
| 0.005 mg/l , sample collected Nov 30, 2009, sampling point MRT000 | Monochloroacetic Acid 2450 EPA method 552.2 | Not recorded |
| 0.023 mg/l , sample collected Nov 30, 2009, sampling point MRT000 | Dichloroacetic Acid 2451 EPA method 552.2 | Not recorded |
| 0.022 mg/l , sample collected Nov 30, 2009, sampling point MRT000 | Trichloroacetic Acid 2452 EPA method 552.2 | Not recorded |
| Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Nov 30, 2009, sampling point MRT000 | Monobromoacetic Acid 2453 EPA method 552.2 | Not recorded |
| Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Nov 30, 2009, sampling point MRT000 | Dibromoacetic Acid 2454 EPA method 552.2 | Not recorded |
| 0.05 mg/l , sample collected Nov 30, 2009, sampling point MRT000 | Total Haloacetic Acids (Haa5) 2456 | Oct 1, 2009 – Dec 31, 2009 |
|
||
| Not detected below 0.002 mg/l Minimum Reporting Level , sample collected Jul 20, 2009, sampling point MRT000 | Monochloroacetic Acid 2450 EPA method 552.2 | Not recorded |
| 0.021 mg/l , sample collected Jul 20, 2009, sampling point MRT000 | Dichloroacetic Acid 2451 EPA method 552.2 | Not recorded |
| 0.013 mg/l , sample collected Jul 20, 2009, sampling point MRT000 | Trichloroacetic Acid 2452 EPA method 552.2 | Not recorded |
| Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jul 20, 2009, sampling point MRT000 | Monobromoacetic Acid 2453 EPA method 552.2 | Not recorded |
| Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jul 20, 2009, sampling point MRT000 | Dibromoacetic Acid 2454 EPA method 552.2 | Not recorded |
| 0.03 mg/l , sample collected Jul 20, 2009, sampling point MRT000 | Total Haloacetic Acids (Haa5) 2456 | Jul 1, 2009 – Sep 30, 2009 |
|
||
| 29.7 ug/l , sample collected Jul 20, 2009, sampling point MRT000 | Chloroform 2941 EPA method 524.2 | Not recorded |
| Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 20, 2009, sampling point MRT000 | Bromoform 2942 EPA method 524.2 | Not recorded |
| 6.96 ug/l , sample collected Jul 20, 2009, sampling point MRT000 | Bromodichloromethane 2943 EPA method 524.2 | Not recorded |
| 1.06 ug/l , sample collected Jul 20, 2009, sampling point MRT000 | Dibromochloromethane 2944 EPA method 524.2 | Not recorded |
| 37.72 ug/l , sample collected Jul 20, 2009, sampling point MRT000 | TTHM 2950 EPA method 524.2 | Jul 1, 2009 – Sep 30, 2009 |
|
||
| 0.004 mg/l , sample collected May 18, 2009, sampling point MRT000 | Monochloroacetic Acid 2450 EPA method 552.2 | Not recorded |
| 0.038 mg/l , sample collected May 18, 2009, sampling point MRT000 | Dichloroacetic Acid 2451 EPA method 552.2 | Not recorded |
| 0.031 mg/l , sample collected May 18, 2009, sampling point MRT000 | Trichloroacetic Acid 2452 EPA method 552.2 | Not recorded |
| Not detected below 0.001 mg/l Minimum Reporting Level , sample collected May 18, 2009, sampling point MRT000 | Monobromoacetic Acid 2453 EPA method 552.2 | Not recorded |
| Not detected below 0.001 mg/l Minimum Reporting Level , sample collected May 18, 2009, sampling point MRT000 | Dibromoacetic Acid 2454 EPA method 552.2 | Not recorded |
| 0.07 mg/l , sample collected May 18, 2009, sampling point MRT000 | Total Haloacetic Acids (Haa5) 2456 | Apr 1, 2009 – Jun 30, 2009 |
|
||
| 76.4 ug/l , sample collected May 18, 2009, sampling point MRT000 | Chloroform 2941 EPA method 524.2 | Not recorded |
| Not detected below 1 ug/l Minimum Reporting Level , sample collected May 18, 2009, sampling point MRT000 | Bromoform 2942 EPA method 524.2 | Not recorded |
| 7.34 ug/l , sample collected May 18, 2009, sampling point MRT000 | Bromodichloromethane 2943 EPA method 524.2 | Not recorded |
| Not detected below 1 ug/l Minimum Reporting Level , sample collected May 18, 2009, sampling point MRT000 | Dibromochloromethane 2944 EPA method 524.2 | Not recorded |
| 83.74 ug/l , sample collected May 18, 2009, sampling point MRT000 | TTHM 2950 EPA method 524.2 | Apr 1, 2009 – Jun 30, 2009 |
|
||
| 25.3 ug/l , sample collected Mar 2, 2009, sampling point MRT000 | Chloroform 2941 EPA method 524.2 | Not recorded |
| Not detected below 1 ug/l Minimum Reporting Level , sample collected Mar 2, 2009, sampling point MRT000 | Bromoform 2942 EPA method 524.2 | Not recorded |
| 5.63 ug/l , sample collected Mar 2, 2009, sampling point MRT000 | Bromodichloromethane 2943 EPA method 524.2 | Not recorded |
| Not detected below 1 ug/l Minimum Reporting Level , sample collected Mar 2, 2009, sampling point MRT000 | Dibromochloromethane 2944 EPA method 524.2 | Not recorded |
| 30.93 ug/l , sample collected Mar 2, 2009, sampling point MRT000 | TTHM 2950 EPA method 524.2 | Jan 1, 2009 – Mar 31, 2009 |
|
||
| Not detected below 0.002 mg/l Minimum Reporting Level , sample collected Jan 13, 2009, sampling point MRT000 | Monochloroacetic Acid 2450 EPA method 552.2 | Not recorded |
| 0.022 mg/l , sample collected Jan 13, 2009, sampling point MRT000 | Dichloroacetic Acid 2451 EPA method 552.2 | Not recorded |
| 0.017 mg/l , sample collected Jan 13, 2009, sampling point MRT000 | Trichloroacetic Acid 2452 EPA method 552.2 | Not recorded |
| Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jan 13, 2009, sampling point MRT000 | Monobromoacetic Acid 2453 EPA method 552.2 | Not recorded |
| Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jan 13, 2009, sampling point MRT000 | Dibromoacetic Acid 2454 EPA method 552.2 | Not recorded |
| 0.03 mg/l , sample collected Jan 13, 2009, sampling point MRT000 | Total Haloacetic Acids (Haa5) 2456 | Jan 1, 2009 – Mar 31, 2009 |
|
||
| 56.6 ug/l , sample collected Aug 25, 2008, sampling point SM2 | Chloroform 2941 EPA method 524.2 | Not recorded |
| Not detected below 1 ug/l Minimum Reporting Level , sample collected Aug 25, 2008, sampling point SM2 | Bromoform 2942 EPA method 524.2 | Not recorded |
| 9.9 ug/l , sample collected Aug 25, 2008, sampling point SM2 | Bromodichloromethane 2943 EPA method 524.2 | Not recorded |
| 1.04 ug/l , sample collected Aug 25, 2008, sampling point SM2 | Dibromochloromethane 2944 EPA method 524.2 | Not recorded |
| 67.54 ug/l , sample collected Aug 25, 2008, sampling point SM2 | TTHM 2950 EPA method 524.2 | Not recorded |
|
||
| 37.6 ug/l , sample collected Aug 25, 2008, sampling point SM1 | Chloroform 2941 EPA method 524.2 | Not recorded |
| Not detected below 1 ug/l Minimum Reporting Level , sample collected Aug 25, 2008, sampling point SM1 | Bromoform 2942 EPA method 524.2 | Not recorded |
| 8.75 ug/l , sample collected Aug 25, 2008, sampling point SM1 | Bromodichloromethane 2943 EPA method 524.2 | Not recorded |
| 1.28 ug/l , sample collected Aug 25, 2008, sampling point SM1 | Dibromochloromethane 2944 EPA method 524.2 | Not recorded |
| 47.63 ug/l , sample collected Aug 25, 2008, sampling point SM1 | TTHM 2950 EPA method 524.2 | Not recorded |
-
- Collected
- Nov 30, 2009
- Sampling point
- MRT000 Max. Res. Time
- Sample type
- Routine
- Lab sample
- 091201-013TH
- Laboratory
- MSDH Lab
-
Chloroform 2941 EPA method 524.2
- Result
- 36 ug/l
- Monitoring period
- Not recorded
-
Bromoform 2942 EPA method 524.2
- Result
- Not detected below 1 ug/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Bromodichloromethane 2943 EPA method 524.2
- Result
- 7.69 ug/l
- Monitoring period
- Not recorded
-
Dibromochloromethane 2944 EPA method 524.2
- Result
- 1.17 ug/l
- Monitoring period
- Not recorded
-
TTHM 2950 EPA method 524.2
- Result
- 44.86 ug/l
- Monitoring period
- Oct 1, 2009 – Dec 31, 2009
-
- Collected
- Nov 30, 2009
- Sampling point
- MRT000 Max. Res. Time
- Sample type
- Routine
- Lab sample
- 091201-013HA
- Laboratory
- MSDH Lab
-
Monochloroacetic Acid 2450 EPA method 552.2
- Result
- 0.005 mg/l
- Monitoring period
- Not recorded
-
Dichloroacetic Acid 2451 EPA method 552.2
- Result
- 0.023 mg/l
- Monitoring period
- Not recorded
-
Trichloroacetic Acid 2452 EPA method 552.2
- Result
- 0.022 mg/l
- Monitoring period
- Not recorded
-
Monobromoacetic Acid 2453 EPA method 552.2
- Result
- Not detected below 0.001 mg/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Dibromoacetic Acid 2454 EPA method 552.2
- Result
- Not detected below 0.001 mg/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Total Haloacetic Acids (Haa5) 2456
- Result
- 0.05 mg/l
- Monitoring period
- Oct 1, 2009 – Dec 31, 2009
-
- Collected
- Jul 20, 2009
- Sampling point
- MRT000 Max. Res. Time
- Sample type
- Routine
- Lab sample
- 090721-001HA
- Laboratory
- MSDH Lab
-
Monochloroacetic Acid 2450 EPA method 552.2
- Result
- Not detected below 0.002 mg/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Dichloroacetic Acid 2451 EPA method 552.2
- Result
- 0.021 mg/l
- Monitoring period
- Not recorded
-
Trichloroacetic Acid 2452 EPA method 552.2
- Result
- 0.013 mg/l
- Monitoring period
- Not recorded
-
Monobromoacetic Acid 2453 EPA method 552.2
- Result
- Not detected below 0.001 mg/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Dibromoacetic Acid 2454 EPA method 552.2
- Result
- Not detected below 0.001 mg/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Total Haloacetic Acids (Haa5) 2456
- Result
- 0.03 mg/l
- Monitoring period
- Jul 1, 2009 – Sep 30, 2009
-
- Collected
- Jul 20, 2009
- Sampling point
- MRT000 Max. Res. Time
- Sample type
- Routine
- Lab sample
- 090721-001TH
- Laboratory
- MSDH Lab
-
Chloroform 2941 EPA method 524.2
- Result
- 29.7 ug/l
- Monitoring period
- Not recorded
-
Bromoform 2942 EPA method 524.2
- Result
- Not detected below 1 ug/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Bromodichloromethane 2943 EPA method 524.2
- Result
- 6.96 ug/l
- Monitoring period
- Not recorded
-
Dibromochloromethane 2944 EPA method 524.2
- Result
- 1.06 ug/l
- Monitoring period
- Not recorded
-
TTHM 2950 EPA method 524.2
- Result
- 37.72 ug/l
- Monitoring period
- Jul 1, 2009 – Sep 30, 2009
-
- Collected
- May 18, 2009
- Sampling point
- MRT000 Max. Res. Time
- Sample type
- Routine
- Lab sample
- 090519-009HA
- Laboratory
- MSDH Lab
-
Monochloroacetic Acid 2450 EPA method 552.2
- Result
- 0.004 mg/l
- Monitoring period
- Not recorded
-
Dichloroacetic Acid 2451 EPA method 552.2
- Result
- 0.038 mg/l
- Monitoring period
- Not recorded
-
Trichloroacetic Acid 2452 EPA method 552.2
- Result
- 0.031 mg/l
- Monitoring period
- Not recorded
-
Monobromoacetic Acid 2453 EPA method 552.2
- Result
- Not detected below 0.001 mg/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Dibromoacetic Acid 2454 EPA method 552.2
- Result
- Not detected below 0.001 mg/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Total Haloacetic Acids (Haa5) 2456
- Result
- 0.07 mg/l
- Monitoring period
- Apr 1, 2009 – Jun 30, 2009
-
- Collected
- May 18, 2009
- Sampling point
- MRT000 Max. Res. Time
- Sample type
- Routine
- Lab sample
- 090519-009TH
- Laboratory
- MSDH Lab
-
Chloroform 2941 EPA method 524.2
- Result
- 76.4 ug/l
- Monitoring period
- Not recorded
-
Bromoform 2942 EPA method 524.2
- Result
- Not detected below 1 ug/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Bromodichloromethane 2943 EPA method 524.2
- Result
- 7.34 ug/l
- Monitoring period
- Not recorded
-
Dibromochloromethane 2944 EPA method 524.2
- Result
- Not detected below 1 ug/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
TTHM 2950 EPA method 524.2
- Result
- 83.74 ug/l
- Monitoring period
- Apr 1, 2009 – Jun 30, 2009
-
- Collected
- Mar 2, 2009
- Sampling point
- MRT000 Max. Res. Time
- Sample type
- Routine
- Lab sample
- 090303-003TH
- Laboratory
- MSDH Lab
-
Chloroform 2941 EPA method 524.2
- Result
- 25.3 ug/l
- Monitoring period
- Not recorded
-
Bromoform 2942 EPA method 524.2
- Result
- Not detected below 1 ug/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Bromodichloromethane 2943 EPA method 524.2
- Result
- 5.63 ug/l
- Monitoring period
- Not recorded
-
Dibromochloromethane 2944 EPA method 524.2
- Result
- Not detected below 1 ug/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
TTHM 2950 EPA method 524.2
- Result
- 30.93 ug/l
- Monitoring period
- Jan 1, 2009 – Mar 31, 2009
-
- Collected
- Jan 13, 2009
- Sampling point
- MRT000 Max. Res. Time
- Sample type
- Routine
- Lab sample
- 090115-015HA
- Laboratory
- MSDH Lab
-
Monochloroacetic Acid 2450 EPA method 552.2
- Result
- Not detected below 0.002 mg/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Dichloroacetic Acid 2451 EPA method 552.2
- Result
- 0.022 mg/l
- Monitoring period
- Not recorded
-
Trichloroacetic Acid 2452 EPA method 552.2
- Result
- 0.017 mg/l
- Monitoring period
- Not recorded
-
Monobromoacetic Acid 2453 EPA method 552.2
- Result
- Not detected below 0.001 mg/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Dibromoacetic Acid 2454 EPA method 552.2
- Result
- Not detected below 0.001 mg/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Total Haloacetic Acids (Haa5) 2456
- Result
- 0.03 mg/l
- Monitoring period
- Jan 1, 2009 – Mar 31, 2009
-
- Collected
- Aug 25, 2008
- Sampling point
- SM2 Location withheld
- Sample type
- Routine
- Lab sample
- 080826-004TH
- Laboratory
- MSDH Lab
- Monitoring period
- Not recorded
-
Chloroform 2941 EPA method 524.2
- Result
- 56.6 ug/l
-
Bromoform 2942 EPA method 524.2
- Result
- Not detected below 1 ug/l Minimum Reporting Level
-
Bromodichloromethane 2943 EPA method 524.2
- Result
- 9.9 ug/l
-
Dibromochloromethane 2944 EPA method 524.2
- Result
- 1.04 ug/l
-
TTHM 2950 EPA method 524.2
- Result
- 67.54 ug/l
-
- Collected
- Aug 25, 2008
- Sampling point
- SM1 Location withheld
- Sample type
- Routine
- Lab sample
- 080826-003TH
- Laboratory
- MSDH Lab
- Monitoring period
- Not recorded
-
Chloroform 2941 EPA method 524.2
- Result
- 37.6 ug/l
-
Bromoform 2942 EPA method 524.2
- Result
- Not detected below 1 ug/l Minimum Reporting Level
-
Bromodichloromethane 2943 EPA method 524.2
- Result
- 8.75 ug/l
-
Dibromochloromethane 2944 EPA method 524.2
- Result
- 1.28 ug/l
-
TTHM 2950 EPA method 524.2
- Result
- 47.63 ug/l
Routine (10).