MIT HAYSTACK OBSERVATORY
PWS ID: MA3301023 · CAMBRIDGE, Massachusetts 02139
Population Served
40
Total Violations
154
Health-Based Violations
0
Water Source
Groundwater
System Details
- System Type
- Non-Transient Non-Community
- Owner Type
- Private
- Connections
- 1
- County
- Middlesex
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 148
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Lead and Copper Rule | MR | 6 | 2008 |
| 1,2,4-Trichlorobenzene | MR | 5 | 2001 |
| cis-1,2-Dichloroethylene | MR | 5 | 2001 |
| DICHLOROMETHANE | MR | 5 | 2001 |
| Vinyl chloride | MR | 5 | 2001 |
| 1,1,1-Trichloroethane | MR | 5 | 2001 |
| 1,2-Dichloropropane | MR | 5 | 2001 |
| Trichloroethylene | MR | 5 | 2001 |
| 1,1,2-Trichloroethane | MR | 5 | 2001 |
| Tetrachloroethylene | MR | 5 | 2001 |
| CHLOROBENZENE | MR | 5 | 2001 |
| Toluene | MR | 5 | 2001 |
| Ethylbenzene | MR | 5 | 2001 |
| Xylenes, Total | MR | 5 | 2001 |
| p-Dichlorobenzene | MR | 5 | 2001 |
| trans-1,2-Dichloroethylene | MR | 5 | 2001 |
| Benzene | MR | 5 | 2001 |
| Styrene | MR | 5 | 2001 |
| o-Dichlorobenzene | MR | 5 | 2001 |
| 1,1-Dichloroethylene | MR | 5 | 2001 |
| 1,2-Dichloroethane | MR | 5 | 2001 |
| Carbon tetrachloride | MR | 5 | 2001 |
| Coliform (TCR) | MR | 2 | 2008 |
| Methoxychlor | MR | 1 | 1997 |
| Toxaphene | MR | 1 | 1997 |
| Dalapon | MR | 1 | 1997 |
| Diquat | MR | 1 | 1997 |
| Glyphosate | MR | 1 | 1997 |
| Di(2-ethylhexyl) adipate | MR | 1 | 1997 |
| Simazine | MR | 1 | 1997 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.