Downtown Pawtucket glass along the I-95 corridor collects diesel and brake-dust film, and the Blackstone valley's road de-icing salt lasts all winter.
Pawtucket runs its own supply, blending surface water and groundwater from the Abbott Run watershed at a plant opened in 2008, and publishes no hardness value, so don't assume it behaves like the Providence Water supply next door. Downtown glass along I-95 collects diesel and brake-dust film, and Blackstone valley road salt hangs on through the winter. Glazing age and reach set the price more than the water; July to September is the window, and a single-story exterior runs $260 to $430.
Unpublished, and this is the city where guessing would be least defensible. The Pawtucket Water Supply Board names no hardness figure, and its supply is a blend of surface and groundwater out of the Abbott Run watershed rather than a single reservoir — so there is no reason to assume it matches the Providence Water cities on either side of it. Judge the glass instead: let a rinse dry on one test pane, and if it dries clear, mineral is not the constraint in Pawtucket.
| Hardness | not published Pawtucket Water Supply Board publishes no hardness figure in its reporting, which publishes no hardness value. |
|---|---|
| Sodium | 36.1–57.7 mg/L |
| Disinfectant | free chlorine |
| Source and treatment | Surface-and-groundwater blend from the Abbott Run watershed · Diffused aeration, granular activated carbon, coagulation, flocculation, clarification, ultrafiltration membranes, ultraviolet radiation, post-chlorination, post pH adjustment, a polyphosphate inhibitor and fluoridation · No softening step. |
Not in the report: pH, alkalinity, corrosion index, iron, manganese, chloride and total dissolved solids.
SOURCE · Pawtucket Water Supply Board 2025 Consumer Confidence Report (pwsb.org), with the EPA SDWIS federal treatment record, PWS RI1592021 · How we source these numbers
Winter road salt out of the Blackstone valley and spring tree pollen set the two residue peaks, and the I-95 corridor adds a constant traffic film downtown that does not have a season at all. Residential work holds longest booked for June or September; commercial frontage along the interstate needs a frequency interval, not a seasonal one.
RHODE ISLAND SEASON BY SEASON →Pawtucket runs its own supply — surface water and groundwater blended out of the Abbott Run watershed, treated at a plant commissioned in 2008 that replaced a 1938 filtration works. That makes it the mineral odd one out in a metro otherwise drinking Providence Water's Scituate reservoir supply, and the Pawtucket Water Supply Board does not publish a hardness figure. The operational distinctives are the Slater Mill historic district's large pre-1900 industrial glazing and diesel film along the I-95 corridor.
Pawtucket is the one city in the Providence cluster that is not on Providence Water. The Pawtucket Water Supply Board states that its resources consist of both surface water and groundwater in the Abbott Run watershed, a tributary of the Blackstone River — so this is a blended supply, not the single-reservoir surface source the rest of the metro drinks.
The watershed crosses a state line. It lies within Cumberland in Rhode Island and the Massachusetts towns of Wrentham, Plainville and Attleboro. The board owns roughly 10 percent of it outright while managing, per the Rhode Island Department of Health's source water assessment, about 97 percent of the Pawtucket and Cumberland reservoir watershed plus an overlapping wellhead protection area.
Diamond Hill Reservoir, also called the Pawtucket Upper Reservoir, is the main impoundment. Its earthen dam was built in 1971, standing 80 feet high with a 2,000-foot crest, holding a maximum of 15,680 acre-feet across roughly 390 acres. Arnold Mills Reservoir sits immediately south of it.
The treatment plant is new by New England standards — commissioned in 2008, with a raw water pumping station rated at 26 million gallons a day through eight intake screens and standby power sized to run the whole facility through an outage. Before that, a single filtration plant built in 1938 at Happy Hollow Pond in Cumberland carried the entire system for about seventy years.
Pawtucket has been delivering water since 2 February 1878, when the system was 24 miles of pipe. By 1924 it served 113,000 people. The board itself was created in the early 1970s as a semi-autonomous agency of the city, funded as an enterprise with rates set by the board and approved by the Rhode Island Public Utilities Commission.
The board wholesales beyond its own borders: it serves Pawtucket, Central Falls and the Valley Falls section of Cumberland, and the Town of Cumberland buys from it wholesale. A crew working across the Pawtucket, Central Falls and Valley Falls line is on one water chemistry throughout, which is unusual in this metro.
Price here tracks glazing age and reach more than anything in the water. Slater Mill district commercial work prices on sash size and conservation pacing, Quality Hill prices on careful hand technique over production rate, and downtown storefronts price on the degreasing step the I-95 film forces before the glass can be squeegeed.
Woodlawn and Oak Hill homeowners can handle their own glass with basic kit. Quality Hill and Slater are where a professional earns the fee — original pre-1900 glazing is unforgiving of pressure and of any scraper, and the mill-district commercial sashes are large, fixed and often reachable only from a ladder or pole.
OPEN COST ESTIMATOR →2025 annual mean at the Ccri Liston Campus Rooftop monitor, 1 Hilton St, Providence RI, 8.2 km south-west of the city (EPA site 44-007-0022).
2025 annual mean at the Vernon St, Pawtucket monitor, Vernon Street Trailer, 0.6 km west of the city (EPA site 44-007-0026).
Largest air release: Cooley Inc, 350 Esten AVE (textiles), inside the city limits, 995 lb in 2024.
During a declared water emergency, Pawtucket bans using city water to wash or flush sidewalks, water lawns and shrubs, wash vehicles or fill wading and swimming pools.
Pawtucket Code §401-2: use of water prohibited for certain purposes · checked September 2026
Pawtucket prohibits discharging construction waste, building material, truck washout, chemicals, litter or other waste into city rights-of-way, storm sewers or other city property, with a $200 fine and removal at the violator's expense within 10 days.
Pawtucket Code §335-14: discharge of other wastes prohibited · checked September 2026
Pawtucket's Historic District Commission reviews all plans for construction, alteration, removal or demolition that affects the exterior appearance of a designated structure, and its failure to act within 45 days of a complete application counts as approval.
Pawtucket Zoning Code §410-36: powers and procedures · Pawtucket Zoning Code §410-38: failure of Commission to act · checked September 2026
Pure marine aerosol on the open-Atlantic exposures. Heavier than the Long Island Sound versions across the Connecticut shoreline. Extended alkaline-soap dwell plus citric finish. Monthly visit frequency on year-round occupied coastal residential.
Unpublished, and this is the city where guessing would be least defensible. The Pawtucket Water Supply Board names no hardness figure, and its supply is a blend of surface and groundwater out of the Abbott Run watershed rather than a single reservoir — so there is no reason to assume it matches the Providence Water cities on either side of it.
Residential window cleaning in Pawtucket typically runs $9–14 per pane or $260–430 for a standard single-story exterior. Price here tracks glazing age and reach more than anything in the water.
Pawtucket's drier, frost-free months are July to September, by NOAA's 1991–2020 normals for the Woonsocket station, where April brings the most rain. The calendar on this page marks July (after the May 4 bloom and after smoke season). Frost nights usually run from October 19 to April 22.
Pawtucket Water Supply Board publishes neither hardness nor dissolved solids, so rinse one pane and let it dry in sun; a white ring means switch to pure water. Iron, manganese, sodium and chloride all sit under this site's flags (highest: sodium up to 57.7 mg/L). It draws on surface-and-groundwater blend from the Abbott Run watershed.
In Pawtucket the dominant residue patterns include i-95 corridor diesel and brake-dust film on downtown commercial elevations and blackstone valley road de-icing salt through the winter months.
Woodlawn and Oak Hill homeowners can handle their own glass with basic kit. Quality Hill and Slater are where a professional earns the fee — original pre-1900 glazing is unforgiving of pressure and of any scraper, and the mill-district commercial sashes are large, fixed and often reachable only from a ladder or pole.
Pre-1900 detached residential on the upper terrace with substantial original glazing still in place. Soft-pressure technique and no scraper on front elevations; wavy glass scratches on contact. Slater and Oak Hill have their own housing stock and glazing as well.
Just over the Rhode Island line