Paterson's mill-era steel sash rust-stains at the glazing line and pre-war putty is breaking down, while Passaic Valley water runs 70 to 140 mg/L hard.
Paterson's Passaic Valley water ranges from moderately hard to hard, enough to show on dark steel frames and in direct sun but not enough to need acid as routine. Mill-era steel sash rust-stains at the glazing line and pre-war putty is breaking down, so the careful work suits July, September and October. Row houses with party walls and no off-street parking make setup the main cost, so two jobs with the same pane count can differ by half a day; a single-story exterior runs $280 to $480.
Four to eight grains is enough to see on dark steel frames and in direct sun, and not enough to justify acid as routine. The wider point is that PVWC publishes a range spanning moderately hard to hard rather than a single value, so the honest expectation is that results vary week to week with the blend rather than staying fixed at one address.
Figures by plant, as reported.
| Hardness | 70–140 mg/L as CaCO₃ Moderately hard to hard in the commission's own words, approximately 4 to 8 grains per gallon, as published by Passaic Valley Water Commission. |
|---|---|
| pH | 7.78–8.38 |
| Alkalinity | 44–89 mg/L as CaCO₃ |
| Iron | 0–0.11 mg/L |
| Manganese | 0.0128 mg/L (range 0.00385–0.0405) |
| Sodium | 34.7–138.8 mg/L |
| Chloride | 55.4–185.1 mg/L |
| Total dissolved solids | 170–533 mg/L |
| Disinfectant | ozone + chlorine |
| Source and treatment | The Passaic and Pompton rivers and Point View Reservoir, treated at PVWC's Little Falls plant, blended for most customers with Wanaque Reservoir water bought from the North Jersey District Water Supply Commission · Little Falls: high-rate sand-ballasted coagulation, flocculation and sedimentation, ozone primary disinfection, granular activated carbon and sand filtration, chlorine residual. Wanaque: conventional coagulation, flocculation and sedimentation with ferric sulfate, sand and anthracite filtration, chlorine · No softening step. |
Not in the report: corrosion index.
SOURCE · Passaic Valley Water Commission 2026 Consumer Confidence Report (2025 data), Table of Detected Secondary Contaminants · How we source these numbers
Interval here is set by the street rather than the supply. Traffic particulate in the dense downtown core rebuilds within days on ground-floor frontage, while upper-storey mill glazing holds much longer; flood-exposed properties along the river reset entirely after high water. A schedule built on an average across the city will be wrong at both ends.
NEW JERSEY SEASON BY SEASON →PVWC states on its own site that the main system runs 4 to 8 grains per gallon, about 70 to 140 mg/L, and that it does not recommend softeners because further softening could corrode household plumbing. Paterson's water is unremarkable; its windows are not. Hamilton built the city around the Great Falls in the 1790s and the silk mills left behind a concentration of multi-light steel casement sash that exists almost nowhere else — rusting at the glazing line, holding putty differently from wood, and demanding its own technique. Density does the rest: access time, not pane count, sets the price here.
The Passaic Valley Water Commission publishes the figure as a range rather than a point: the main system runs approximately 4 to 8 grains per gallon, about 70 to 140 mg/L, which it describes as moderately hard to hard. Its own report narrows that further, giving 66 to 154 for Little Falls water against 52.0 for the blended Wanaque supply — so the number at a given tap depends on the blend arriving that week.
PVWC goes further than most utilities and advises against treatment: it states it does not recommend water softeners in its main service area, because further softening the water may cause corrosion of household plumbing. That is a utility telling customers the water is fine as delivered, and it is the strongest argument available here against a filtered-rinse upsell pitched on mineral grounds.
The same page shows how far a single utility's water can vary. PVWC's Post Brook system in West Milford, on groundwater wells, runs 20 to 22 grains per gallon — roughly 340 to 375 mg/L, very hard, and two and a half times the top of the main system's range. One commission, two supplies, opposite ends of the scale.
Supply is the Passaic River drawn at Totowa and treated at the Alan C. Levine plant in Little Falls, with the Pompton River and the Point View Reservoir as alternates and a blend of North Jersey District Water Supply Commission water from the Wanaque plant for most main-system neighbourhoods. A USGS monitoring station sits just upstream of the intake to give advance warning of source-water changes.
Paterson's defining glazing is industrial. Hamilton founded the city in the 1790s to harness the Great Falls, and the silk mills that followed left a stock of multi-light steel casement windows that is unusual anywhere and concentrated here. Steel sash rusts at the glazing line, holds putty differently from wood, and needs its own handling — it is the single most distinctive technical skill in this market.
Density is the economic constraint. Pre-1900 row stock with party walls, shared sidewalks and effectively no off-street parking means a Paterson job with the same pane count as a suburban job takes substantially longer. Pricing by pane loses money here; pricing by access time does not.
The Passaic floods, and it floods the same neighbourhoods repeatedly. Riverside and the low ground carry frames and sills with real water history — rot, failed putty, swollen sash — so the first clean on a flood-exposed property is a condition assessment as much as a cleaning.
NYC-metro commercial overflows into Passaic County and the institutional volume here is meaningful — municipal buildings, schools and the national park's own structures. That work is specified and reviewed rather than casually contracted, which favours crews who document their methods.
Older glazing putty across the pre-war stock has reached the end of its service life in many buildings. Solvent-heavy cleaners soften it and aggressive scraping pulls it, so the safe default across most of this city is neutral chemistry and no blade.
Access time is the whole model. Party-wall row stock, shared sidewalks and no off-street parking mean setup and carry dominate the hour, so two jobs with identical pane counts can differ by half a day. Steel-casement work prices above ordinary residential because it is slower and carries real liability, and the municipal and national-park institutional book prices at bid with documentation attached.
Steel casement is the line in Paterson, and it is a technical line rather than an access one. Multi-light mill sash rusts at the glazing bead, carries putty that behaves nothing like wood-sash putty, and punishes a blade or a solvent-heavy cleaner with damage that cannot be undone. A homeowner on modern glazing in the Manor Section is on safe ground; anyone working the mill stock without having handled steel sash before will make it worse.
OPEN COST ESTIMATOR →2025 annual mean at the IS 52 monitor, IS 52 681 Kelly ST, 24.5 km south-east of the city (EPA site 36-005-0110).
2025 annual mean at the Paterson monitor, Paterson Board of Health, 176 Broadway, 0.6 km north-west of the city (EPA site 34-031-0005).
Largest air release: A. ZEREGA'S Sons Inc., 20-01 Broadway (food), 1.1 km outside the city limits, 14,000 lb in 2024.
Paterson requires owners of buildings on the city water supply to keep service pipes, fixtures and connections in good repair so no water is wasted and to make needed repairs at once, and it places duties on tenants too.
Paterson Code §473-3: duties to prevent waste of water · checked September 2026
Paterson's mobile car wash rules bar discharging wastewater, soap or chemicals into the stormwater system and require an impervious containment mat or wash pit plus a working water recovery system, the city's clearest statement of how it treats mobile wash runoff.
Paterson Code §434-6: prohibited conduct · Paterson Code §434-5: vehicle requirements · checked September 2026
Paterson's 2014 Historic Preservation Ordinance puts replacing windows on a listed landmark, or on any building inside a designated district, among the exterior changes that need a construction permit, and no work (even ordinary maintenance or repair) may start before the Historic Preservation Commission has reviewed it. Interior work is exempt unless visible outside; emergencies get a meeting within seven days.
Paterson Historic Preservation Ordinance (2014): Articles IX–XI, actions requiring review · checked September 2026
The mid-Atlantic hardwood pollen wave is one of the heaviest in the country. Oaks, maples, and elms produce yellow-green pollen layers on horizontal glass and the upper third of vertical glass through the second half of April and the first half of May. Requires a surfactant pre-rinse on most spring jobs.
The pre-1945 housing stock in Princeton, Hopewell, Lambertville, Montclair, Maplewood, and the older Hudson and Essex County suburbs is reaching the end of its original glazing putty service life. The crumbling putty produces a chalky residue on the lower edge of pre-war wood-sash glass that cleaning does not solve. Documentation and a glazier referral are appropriate.
Paterson runs on Passaic Valley Water Commission lake or reservoir surface water at a published 70–140 mg/L (CaCO₃) — moderately hard to hard in the commission's own words, approximately 4 to 8 grains per gallon. Four to eight grains is enough to see on dark steel frames and in direct sun, and not enough to justify acid as routine.
Residential window cleaning in Paterson typically runs $9–14 per pane or $280–480 for a standard single-story exterior. Access time is the whole model. Party-wall row stock, shared sidewalks and no off-street parking mean setup and carry dominate the hour, so two jobs with identical pane counts can differ by half a day.
Paterson's drier, frost-free months are July and September and October, by NOAA's 1991–2020 normals for the Caldwell Essex County Airport station, where June brings the most rain. The calendar on this page marks July (after the April 27 bloom) and October (after smoke season and before frost). Frost nights usually run from October 28 to April 14.
Not as the final rinse: Passaic Valley Water Commission publishes dissolved solids of 170–533 mg/L, enough to spot as it dries, so finish with pure water. It draws on the Passaic and Pompton rivers and Point View Reservoir, treated at PVWC's Little Falls plant, blended for most customers.
In Paterson the dominant residue patterns include rust staining at the glazing line on mill-era steel sash and pre-war glazing putty degradation. Interval here is set by the street rather than the supply.
Steel casement is the line in Paterson, and it is a technical line rather than an access one. Multi-light mill sash rusts at the glazing bead, carries putty that behaves nothing like wood-sash putty, and punishes a blade or a solvent-heavy cleaner with damage that cannot be undone.
Alexander Hamilton's planned industrial city around a seventy-seven-foot waterfall, now a national historical park. Mill-era steel casement and industrial sash at a density found almost nowhere else. Downtown Paterson and Eastside have their own housing stock and glazing as well.
Just over the New Jersey line