MIT HAYSTACK OBSERVATORY
Massachusetts — Non-Transient Non-Community — PWSID: MA3301023
System Information
| PWSID | MA3301023 |
| System Name | MIT HAYSTACK OBSERVATORY |
| System Type | Non-Transient Non-Community |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Private |
| EPA Region | 01 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Jan 20, 1981 |
| Last Reported | Mar 17, 2026 |
Location & Contact
| State | Massachusetts |
| City | CAMBRIDGE |
| ZIP Code | 02139 |
| Address | 265 MASSACHUSETTS AVE |
| Organization | MASSACHUSETTS INSTITUTE OF TECHNOLOGY |
| Phone | 6177155400 |
Population & Service
| Population Served | 40 |
| Service Connections | 1 |
Drinking Water Violations (154)
This water system has 154 violations recorded in the EPA SDWIS database.
| Begin Date | End Date | Contaminant | Category | Health-Based | Major | Measured | Federal MCL | State MCL | Status | Return to Compliance | Rule |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jul 1, 2008 | — | MR | No | No | — | TT | — | Resolved | Nov 12, 2008 | — | |
| Jul 1, 2008 | — | MR | No | No | — | TT | — | Resolved | Nov 12, 2008 | — | |
| Mar 1, 2008 | Mar 31, 2008 | MR | No | No | — | 5% of samples | — | Archived | Mar 31, 2008 | — | |
| Mar 1, 2008 | Mar 31, 2008 | MR | No | No | — | 5% of samples | — | Archived | Mar 31, 2008 | — | |
| Oct 1, 2001 | Dec 31, 2001 | MR | No | No | — | 1 mg/L | — | Archived | Dec 31, 2001 | — | |
| Oct 1, 2001 | Dec 31, 2001 | MR | No | No | — | 0.005 mg/L | — | Archived | Dec 31, 2001 | — | |
| Oct 1, 2001 | Dec 31, 2001 | MR | No | No | — | 0.005 mg/L | — | Archived | Dec 31, 2001 | — | |
| Oct 1, 2001 | Dec 31, 2001 | MR | No | No | — | 0.005 mg/L | — | Archived | Dec 31, 2001 | — | |
| Oct 1, 2001 | Dec 31, 2001 | MR | No | No | — | 0.005 mg/L | — | Archived | Dec 31, 2001 | — | |
| Oct 1, 2001 | Dec 31, 2001 | MR | No | No | — | 0.1 mg/L | — | Archived | Dec 31, 2001 | — | |
| Oct 1, 2001 | Dec 31, 2001 | MR | No | No | — | 0.005 mg/L | — | Archived | Dec 31, 2001 | — | |
| Oct 1, 2001 | Dec 31, 2001 | MR | No | No | — | 0.1 mg/L | — | Archived | Dec 31, 2001 | — | |
| Oct 1, 2001 | Dec 31, 2001 | MR | No | No | — | 0.07 mg/L | — | Archived | Dec 31, 2001 | — | |
| Oct 1, 2001 | Dec 31, 2001 | MR | No | No | — | 0.002 mg/L | — | Archived | Dec 31, 2001 | — | |
| Oct 1, 2001 | Dec 31, 2001 | MR | No | No | — | 0.005 mg/L | — | Archived | Dec 31, 2001 | — | |
| Oct 1, 2001 | Dec 31, 2001 | MR | No | No | — | 0.1 mg/L | — | Archived | Dec 31, 2001 | — | |
| Oct 1, 2001 | Dec 31, 2001 | MR | No | No | — | 0.007 mg/L | — | Archived | Dec 31, 2001 | — | |
| Oct 1, 2001 | Dec 31, 2001 | MR | No | No | — | 0.005 mg/L | — | Archived | Dec 31, 2001 | — | |
| Oct 1, 2001 | Dec 31, 2001 | MR | No | No | — | 0.2 mg/L | — | Archived | Dec 31, 2001 | — | |
| Oct 1, 2001 | Dec 31, 2001 | MR | No | No | — | 0.075 mg/L | — | Archived | Dec 31, 2001 | — | |
| Oct 1, 2001 | Dec 31, 2001 | MR | No | No | — | 0.7 mg/L | — | Archived | Dec 31, 2001 | — | |
| Oct 1, 2001 | Dec 31, 2001 | MR | No | No | — | 0.07 mg/L | — | Archived | Dec 31, 2001 | — | |
| Oct 1, 2001 | Dec 31, 2001 | MR | No | No | — | 10 mg/L | — | Archived | Dec 31, 2001 | — | |
| Oct 1, 2001 | Dec 31, 2001 | MR | No | No | — | 0.6 mg/L | — | Archived | Dec 31, 2001 | — | |
| Oct 1, 2001 | Dec 31, 2001 | MR | No | No | — | 0.005 mg/L | — | Archived | Dec 31, 2001 | — | |
| Jul 1, 2001 | Sep 30, 2001 | MR | No | No | — | 0.075 mg/L | — | Archived | Sep 30, 2001 | — | |
| Jul 1, 2001 | Sep 30, 2001 | MR | No | No | — | 0.005 mg/L | — | Archived | Sep 30, 2001 | — | |
| Jul 1, 2001 | Sep 30, 2001 | MR | No | No | — | 0.07 mg/L | — | Archived | Sep 30, 2001 | — | |
| Jul 1, 2001 | Sep 30, 2001 | MR | No | No | — | 0.1 mg/L | — | Archived | Sep 30, 2001 | — | |
| Jul 1, 2001 | Sep 30, 2001 | MR | No | No | — | 0.07 mg/L | — | Archived | Sep 30, 2001 | — | |
| Jul 1, 2001 | Sep 30, 2001 | MR | No | No | — | 10 mg/L | — | Archived | Sep 30, 2001 | — | |
| Jul 1, 2001 | Sep 30, 2001 | MR | No | No | — | 0.005 mg/L | — | Archived | Sep 30, 2001 | — | |
| Jul 1, 2001 | Sep 30, 2001 | MR | No | No | — | 0.005 mg/L | — | Archived | Sep 30, 2001 | — | |
| Jul 1, 2001 | Sep 30, 2001 | MR | No | No | — | 0.1 mg/L | — | Archived | Sep 30, 2001 | — | |
| Jul 1, 2001 | Sep 30, 2001 | MR | No | No | — | 0.005 mg/L | — | Archived | Sep 30, 2001 | — | |
| Jul 1, 2001 | Sep 30, 2001 | MR | No | No | — | 0.005 mg/L | — | Archived | Sep 30, 2001 | — | |
| Jul 1, 2001 | Sep 30, 2001 | MR | No | No | — | 0.007 mg/L | — | Archived | Sep 30, 2001 | — | |
| Jul 1, 2001 | Sep 30, 2001 | MR | No | No | — | 0.005 mg/L | — | Archived | Sep 30, 2001 | — | |
| Jul 1, 2001 | Sep 30, 2001 | MR | No | No | — | 0.1 mg/L | — | Archived | Sep 30, 2001 | — | |
| Jul 1, 2001 | Sep 30, 2001 | MR | No | No | — | 0.005 mg/L | — | Archived | Sep 30, 2001 | — | |
| Jul 1, 2001 | Sep 30, 2001 | MR | No | No | — | 0.005 mg/L | — | Archived | Sep 30, 2001 | — | |
| Jul 1, 2001 | Sep 30, 2001 | MR | No | No | — | 0.002 mg/L | — | Archived | Sep 30, 2001 | — | |
| Jul 1, 2001 | Sep 30, 2001 | MR | No | No | — | 0.2 mg/L | — | Archived | Sep 30, 2001 | — | |
| Jul 1, 2001 | Sep 30, 2001 | MR | No | No | — | 1 mg/L | — | Archived | Sep 30, 2001 | — | |
| Jul 1, 2001 | Sep 30, 2001 | MR | No | No | — | 0.7 mg/L | — | Archived | Sep 30, 2001 | — | |
| Jul 1, 2001 | Sep 30, 2001 | MR | No | No | — | 0.6 mg/L | — | Archived | Sep 30, 2001 | — | |
| Jan 1, 2001 | Mar 31, 2001 | MR | No | No | — | 0.1 mg/L | — | Archived | Mar 31, 2001 | — | |
| Jan 1, 2001 | Mar 31, 2001 | MR | No | No | — | 1 mg/L | — | Archived | Mar 31, 2001 | — | |
| Jan 1, 2001 | Mar 31, 2001 | MR | No | No | — | 0.005 mg/L | — | Archived | Mar 31, 2001 | — | |
| Jan 1, 2001 | Mar 31, 2001 | MR | No | No | — | 0.005 mg/L | — | Archived | Mar 31, 2001 | — |
About This Water System
Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.