Caldwell draws on city wells, and its water report prints no secondary-mineral row at all, so this guide explains how to read your own glass instead.
Caldwell's water comes from an unfiltered well field and its report carries no hardness row, so there is no figure to plan around; iron and mineral reach the tap unaltered, which is reason enough to keep sprinkler overspray off the glass. Walls facing open orchard ground need the shortest interval, and that exposure, more than height, is what sets the price. Plan the outside work for July to September, when a single-story exterior costs $210 to $360.
Unpublished, and deliberately not guessed at. The City of Caldwell's water quality report tables twelve detected contaminants and no hardness, calcium, magnesium or dissolved-solids value, so there is no operator figure to quote and the band shown elsewhere on this site is our estimate rather than a measurement. Do not import a number from the neighbouring city either — Nampa publishes a range across its own seventeen wells precisely because wells in this aquifer do not read alike. Test a pane, let the rinse dry on it, and let the glass settle the question.
| Hardness | not published the City of Caldwell Water Department publishes no hardness figure in the City of Caldwell's 2023 annual water quality report (PWS ID3140013). |
|---|---|
| Disinfectant | free chlorine |
| Source and treatment | Groundwater, per the EPA SDWIS federal record · Pre-chlorination; SDWIS records no filtration, softening or other treatment process for the system · No softening step. |
Not in the report: pH, alkalinity, corrosion index, iron, manganese, sodium, chloride and total dissolved solids.
SOURCE · City of Caldwell 2022 Consumer Confidence Report, with the EPA SDWIS federal treatment record, PWS ID3140013 · How we source these numbers
With no mineral figure to work from, the interval here belongs to the air. Orchard and field dust off the Sunnyslope ground runs from bud break through harvest and peaks with tillage and spray; the winter inversion lays a fine grey film that needs detergent rather than water; and the downtown creek frontage carries silt and insect load through the warm months that nowhere else in the city does. Late spring, once the dust settles and before high summer, is the wash that holds.
IDAHO SEASON BY SEASON →Caldwell is a city where the number is missing and the method is still obvious. The water quality report has no hardness row, and the figure on the city's own website belongs to a wastewater discharge report rather than the drinking supply. What is verified is the shape of the system: an unfiltered groundwater well field, disinfected only, managed well by well — which is how one well came to be pulled for arsenic in 2022 without the rest of the city noticing. Above ground the constraints are the Treasure Valley's: high desert summers that dry a pane before a cleaner can finish it, a winter inversion that films everything in fine grey particulate, and the Sunnyslope orchard and row-crop ground immediately upwind. Downtown adds its own variable, because the creek that runs through the commercial core is open again and the glass nearest it behaves differently from the glass two streets away.
Caldwell's water quality report does not answer the hardness question. The city tested for more than eighty contaminants and detected twelve; hardness, calcium, magnesium and total dissolved solids are not among the rows, because hardness is a secondary parameter no utility is required to publish.
There is a trap here worth knowing about if you go looking yourself. The city's own website hosts a table reading “Hardness, total as CaCO3” at 152 to 154 mg/L. It is a wastewater discharge monitoring report — the same document reports raw sewage influent and five-day biochemical oxygen demand — and it describes treated effluent going to the Boise River, not water arriving at a tap. Correct parameter, correct units, the operator's own domain, and the wrong water entirely.
What the city does publish is a violation: arsenic above the limit, first recorded on 29 June 2022. The well was taken out of service shortly afterwards and put through rehabilitation to bring the level down. That is the useful fact about this supply — it is a well field, individual wells differ enough to fail individually, and the city manages it well by well.
Lead and copper came back clean at consumer taps: copper at 0.8 ppm against a 1.3 action level and lead non-detect, with no sites over the limit. On pre-1940 stock that is worth knowing before anyone blames plumbing for a deposit on a sill.
Indian Creek runs open through the middle of downtown, uncovered from the culvert it spent decades in and rebuilt as the centrepiece of the commercial core. An open watercourse through a retail district changes the local job: more ambient humidity against the glass, splash and silt on low frontage, and more insect activity on summer evenings than a dry street two blocks away.
The College of Idaho occupies a campus at the edge of downtown with buildings going back to the early 1900s, and it anchors the kind of recurring institutional book a city of this size does not usually carry. Campus glazing of that era is a heritage-handling job on a contract frequency, which is an unusual combination to price.
Caldwell sits at the head of the Sunnyslope growing district, and the ground immediately southwest of town is orchard, vineyard and row crop rather than subdivision. Prevailing dry-season wind carries field and orchard dust onto exposed south and west elevations, and the spray and tillage calendar out there is what sets the commercial interval.
The supply is groundwater and only groundwater, disinfected with hypochlorite and no filtration plant in the train. That means no runoff season and no turbidity swing — but it also means whatever mineral and iron the aquifer carries arrives essentially unaltered, which is the argument for judging the glass rather than the missing number.
Caldwell prices on exposure more than on height, because the elevations that cost money are the ones facing open orchard ground and needing a shorter interval rather than the ones that need a taller ladder. Downtown frontage prices on frequency and on proximity to the creek. The college and the larger commercial corridors carry the contract work that holds the residential rates down, and heritage sash anywhere in the older core carries a handling premium that has nothing to do with pane count.
The honest answer in Caldwell is that the risk is chemical rather than physical. A homeowner on the newer north side can do their own glass perfectly well, provided nothing acidic or ammoniated touches a coated sealed unit. The two jobs worth hiring out are the opposite ends of the city's stock: tall original sash around the college and downtown, where the wrong tool takes a permanent mark out of old glass, and the exposed Sunnyslope elevations, where the dust load means the job is really a wash-and-return rather than a wash.
OPEN COST ESTIMATOR →2025 annual mean at the Nampa - Ridgecrest monitor, 3730 Ridgecrest Drive, 11.7 km south-east of the city (EPA site 16-027-0010).
Largest air release: Best Bath Systems, 723 Garber Street (plastics and rubber), inside the city limits, 156,798 lb in 2024.
Only people the city authorizes may open, operate or attach a hose to a Caldwell fire hydrant, and blocking access to one is also unlawful. The same section bans malicious or wilful waste of water; when meter readings show waste, the user has 60 days to fix it and pays for the lost water.
Caldwell City Code §04-01-25: prohibited acts · checked September 2026
Caldwell treats any illicit discharge to a storm drain, including private drains, as a code violation unless a listed exemption applies. People whose work can put pollutants into drains must take reasonable measures to reduce them, and leaving refuse or other material where it may wash into an inlet is barred.
Caldwell City Code §13-01-03: discharge regulations and requirements · checked September 2026
After a Caldwell local historic district is designated, no exterior feature of a building there may be altered, restored or removed until the Historic Preservation Commission approves a certificate of appropriateness, whether or not a building permit is also needed. Routine items on the commission's staff-level matrix can be approved by planning staff.
Caldwell City Code §02-17-09: certificate of appropriateness required · checked September 2026
Boise, Meridian, Nampa, Caldwell, Twin Falls, Idaho Falls, Pocatello municipal water. Hard-water mineral residue dominant statewide outside of northern Idaho panhandle. Extended citric pre-treatment (3-5 minutes) plus citric-rinse finish required on most stock.
Wildfire-smoke residue heavy in active fire seasons. The 2017, 2020, and 2024 fire seasons each produced extended residue exposure on residential and commercial statewide. Operators serving statewide residential carry wildfire-smoke residue handling as part of the routine fire-season operating practice. Same handling pattern Easton documents for the Pacific Northwest and Northern California fire-season pattern.
High-elevation UV exposure accelerates IGU seal degradation visibly on Sun Valley, Ketchum, McCall, and surrounding Mountain West corridor residential. Document seal-degradation indicators on each residential visit and provide written notation to customer. Same handling framework applies to Park City and Deer Valley.
Unpublished, and deliberately not guessed at. The City of Caldwell's water quality report tables twelve detected contaminants and no hardness, calcium, magnesium or dissolved-solids value, so there is no operator figure to quote and the band shown elsewhere on this site is our estimate rather than a measurement.
Residential window cleaning in Caldwell typically runs $7–11 per pane or $210–360 for a standard single-story exterior. Caldwell prices on exposure more than on height, because the elevations that cost money are the ones facing open orchard ground and needing a shorter interval rather than the ones that need a taller ladder.
Caldwell's drier, frost-free months are July to September, by NOAA's 1991–2020 normals for the Nampa Sugar Factory station, where January brings the most rain. The calendar on this page marks July (after the April 25 bloom and after smoke season). Frost nights usually run from October 13 to April 29. Normal highs reach 90°F in July and August.
The City of Caldwell Water Department publishes neither hardness nor dissolved solids, so rinse one pane and let it dry in sun; a white ring means switch to pure water. SDWIS records no filtration or softening for the system.
In Caldwell the dominant residue patterns include no published hardness figure — the city's report carries no secondary-mineral row at all and arsenic above the limit at one well from june 2022; the well was pulled and rehabilitated. With no mineral figure to work from, the interval here belongs to the air.
The honest answer in Caldwell is that the risk is chemical rather than physical. A homeowner on the newer north side can do their own glass perfectly well, provided nothing acidic or ammoniated touches a coated sealed unit.
The reopened creek and the plaza around it made this a pedestrian retail core again. Ground-floor glass on short frontages, judged closely by owners, and wetter than the rest of the city year-round — the deposit to plan for is silt and splash, not scale. College of Idaho campus edge and Cleveland Boulevard have their own housing stock and glazing as well.
Just over the Idaho line