One water system, two towns
Rockland doesn't run its own water utility, and it never really has. Since the 1880s, Rockland has been a joint owner, alongside Abington, of the Abington-Rockland Joint Water Works (ARJWW) — a single combined system, under one EPA/MassDEP public water system ID (MA4001000), governed by a Joint Board of Water Commissioners representing both towns. The John F. Hannigan Memorial Reservoir and Hannigan Water Treatment Plant, off Hingham Street, are Rockland's own piece of that shared system — but the water itself blends into one distribution network with Abington's Myers Avenue plant and Pembroke's Great Sandy Bottom Pond plant before it reaches anyone's tap.
That shared structure cuts both ways. It means Rockland and Abington residents are, functionally, drinking the same water and reading the same test results — this isn't a wholesale-purchase arrangement like some neighboring towns have, it's genuine joint ownership going back to a 33,000-foot water main built in 1885–1886. It also means a specific piece of Rockland's own violation history — a low-flow sampling point on Longwater Drive that failed disinfection byproduct limits in 2014–2015 — belongs to the whole system's record, not just a footnote on a map.
| Issue | What happened | Status |
|---|---|---|
| TTHM / HAA5 (disinfection byproducts) | MCL violations, 2014–2015, tied to a low-flow sampling site on Longwater Drive, Rockland | No recurrence reported since |
| PFAS6 (combined) | 22.9 ppt at Hannigan source (Rockland), Mar 2021; MCL exceedances again Q2–Q3 2024 | Hannigan plant: non-detect since Mar 2026. Myers Ave (Abington): pilot treatment, below limit, permanent system underway |
| Total coliform / E. coli | MCL violation, May 2025; boil-water order issued | Resolved within ~72 hours; all follow-up samples clear |
| Lead service lines | System-wide inventory, 2024 | No lead, galvanized-requiring-replacement, or unknown lines found |
Sources: MassDEP/EPA SDWIS violation records; Rockland-MA.gov and Town of Abington public notices; see the full breakdown with citations on the Water data page.
