HACKETTSTOWN, NJ · Mercer County
DIAMOND HILL WATER CO INC Water System
Inactive system
This water system is marked inactive in EPA’s federal records as of August 31, 2004. It is no longer an operating public water system under this PWSID, and no compliance deadlines — including the 2027 Consumer Confidence Report rule — apply to it.
If you are a resident looking for your current water provider, see water systems in Mercer County, NJ.
Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace New Jersey’s official records. Always confirm current status with New Jersey before making decisions based on this information.
System facts
- System ID (PWSID)
- NJ2116001
- System type
- Community Water System
- Population served
- 800
- Service connections
- 271
- Ownership
- privately owned
- Water source
- groundwater (wells)
DIAMOND HILL WATER CO INC is one of 174 community water systems in New Jersey in the 501 to 3,300 people size category, formerly serving 800 people from groundwater.
EPA's federal records list this system as inactive in 2004; the record below is historical.
As of August 1, 2026, its federal record holds 8 entries between 1979 and 1980, all of which EPA lists as closed. Nothing has been added since 1980.
All 8 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves inorganic chemicals and the Radionuclides and Revised Rad Rule.
Violation history
Monitoring, Regular
—Gross Alpha, Excl. Radon and U
July 1, 1980 – June 30, 1984
ArchivedMonitoring, Regular
—Fluoride
June 24, 1979 – June 23, 1982
ArchivedMonitoring, Regular
—Chromium
June 24, 1979 – June 23, 1982
ArchivedMonitoring, Regular
—Arsenic
June 24, 1979 – June 23, 1982
ArchivedMonitoring, Regular
—Cadmium
June 24, 1979 – June 23, 1982
ArchivedMonitoring, Regular
—Barium
June 24, 1979 – June 23, 1982
ArchivedMonitoring, Regular
—Selenium
June 24, 1979 – June 23, 1982
ArchivedMonitoring, Regular
—Mercury
June 24, 1979 – June 23, 1982
Archived
Archived closed in EPA's records (typically due to age or a data correction)
| Period | Violation | Contaminant / rule | Health-based | Status |
|---|---|---|---|---|
| July 1, 1980 – June 30, 1984 | Monitoring, Regular | Gross Alpha, Excl. Radon and U | — | Archived |
| June 24, 1979 – June 23, 1982 | Monitoring, Regular | Fluoride | — | Archived |
| June 24, 1979 – June 23, 1982 | Monitoring, Regular | Chromium | — | Archived |
| June 24, 1979 – June 23, 1982 | Monitoring, Regular | Arsenic | — | Archived |
| June 24, 1979 – June 23, 1982 | Monitoring, Regular | Cadmium | — | Archived |
| June 24, 1979 – June 23, 1982 | Monitoring, Regular | Barium | — | Archived |
| June 24, 1979 – June 23, 1982 | Monitoring, Regular | Selenium | — | Archived |
| June 24, 1979 – June 23, 1982 | Monitoring, Regular | Mercury | — | Archived |
Archived closed in EPA's records (typically due to age or a data correction)
Enforcement actions
- September 30, 1982State Violation/Reminder Notice7 linked violations
Last known contact on file (system is inactive)
Not on record
Phone not on record
HACKETTSTOWN, NJ 07840