Walnut, CA · ZIP 91789 ยท 13.7 miles from Ontario
Window cleaning in Walnut, CA
Walnut is a small, high-ownership city of detached houses in the San Jose Hills, with three different water suppliers. Outside windows are $9 each, plans save up to 15%.
Homes in Walnut
Walnut has 27,611 people in 9 square miles. Median home value is about $1,014,000.
Wikipedia describes the city as lying on the southern slopes of the San Jose Hills, with the Puente Hills to the south, and says it has master-planned single-family homes from 1,800 to 11,200 square feet. Mt. San Antonio College is the largest employer. Walnut's ZIP codes are 91788, 91789 and 91795.
Water in Walnut and what it does to glass
Three providers serve Walnut, according to the city: Walnut Valley Water District, Suburban Water Systems and Golden State Water Company. Walnut Valley's 2025 report lists hardness by source: 234 mg/L from the Weymouth plant, 97 mg/L from Miramar and 215 mg/L from groundwater. Suburban's San Jose Hills report for 2024, the latest we found, lists hardness averaging 187.5 mg/L (range 76 to 303) in one source column and 214.9 mg/L (160 to 274.4) in another. We did not find a Golden State report for the Walnut area.
In short, Walnut water ranges from moderately hard to very hard depending on your supplier and your block. Your water bill shows who supplies you. If the windows show heavy white rings, tell us in your quote request and we will text you for a photo. We quote removal from a photo and never add it without asking. See the hard-water guide.
Wind, dust and sun
The regional pattern is Santa Ana winds from October to February. The air district says Santa Ana winds can lift dust and soil into the air.
| Gust days, 40 mph or more | 0.5 a year (0.1 reach 50 mph) |
| Rain | 18.5 inches a year on 40 days of 0.04 in or more |
| Longest stretch without measurable rain | 133 days, ending 2024-09-15 |
| Days of 100 F or more | 10 a year |
Data: Open-Meteo (open-meteo.com) historical weather API, ERA5 grid; nearby cities can share a cell.
HOAs, roofs and solar panels
Walnut homes run up to 11,200 square feet, and larger homes often have upper-floor glass. We clean upper windows from the ground with the water-fed pole, so there is no ladder to set on a slope. Solar panels on a single-story roof are cleaned from the ground too, $6 a panel. We never walk a roof, and we leave second-story arrays alone. Master-planned neighborhoods often have an association with rules about contractor hours. Tell us when you book.
Walnut electric service and solar billing
An SCE service territory city list includes Walnut. That list is dated 2010, so your bill is the way to confirm your utility today.
The CPUC says the Net Billing Tariff applies to customers who submit an interconnection application on or after April 15, 2023. Customers on the NEM 2.0 tariff are allowed to remain on it for 20 years from the date they interconnected. Your interconnection date decides which you are on. For scale, a University of California San Diego study of 186 California sites found that, on average, sites would have yielded 0.81 percent more annual energy if they had been washed halfway through the summer drought. It did not report results for this city, so yours can differ.
Walnut solar permits and association rules
The City of Walnut has a Solar Energy Systems and Inspections page in its Building Safety Division. A solar array cannot exceed the maximum legal building height set by the Walnut Municipal Code, according to the city page. Under Civil Code 714, association rules that effectively prohibit or restrict solar are void, though reasonable restrictions are allowed. We did not verify named Walnut associations.
Which of our services fit Walnut
Walnut is 13.7 miles from Ontario, toward the edge of our service area. Windows on a plan are the usual start. Two-story homes cost 15 percent more per window. Holiday lights run mid-November to mid-December, about $4 a foot of roofline with the lights included. TV mounting starts at $99.
Price
Walnut pays the same per-window price as every city we serve ($9 a window, $130 minimum). Get an exact price or read the cost guide.
Near Walnut
Walnut is 13.7 miles from Ontario, the hub of our service area. Closest places we also serve:
Guides worth reading
- Window Cleaning Cost in the Inland Empire
- Hard-Water Spots on Windows in the Inland Empire
- TV Mounting Cost in the Inland Empire
Questions from Walnut homeowners
Who supplies water in Walnut?
Three providers: Walnut Valley Water District, Suburban Water Systems and Golden State Water Company. Your bill shows which one serves you.
How hard is Walnut water?
Walnut Valley reported 97 to 234 mg/L by source in 2025, and Suburban reported averages near 188 and 215 mg/L in 2024. That runs from moderately hard to very hard.
Do you clean windows on large two-story homes?
Yes, from the ground with a water-fed pole, at 15 percent more per window.
Sources
- U.S. Census Bureau, American Community Survey, latest release shown by Census Reporter, for Walnut. “27,611... square miles”
- U.S. Census Bureau, American Community Survey, latest release shown by Census Reporter, for Walnut. “$1,014,000... housing units”
- Wikipedia, Walnut, California “Walnut is located on the southern slopes of the San Jose Hills”
- City of Walnut, green links (water providers). “Walnut Valley Water District-(909) 595-7554”
- City of Walnut, green links (water providers). “Suburban Water Systems- (626) 543-2640 Golden State Water Company- (800) 999-4033”
- Walnut Valley Water District, 2025 Annual Water Quality Report (100 percent imported supply; hardness by source). “Hardness, Total [as CaCO3] (ppm) NA NA 234 189 - 280 97”
- Walnut Valley Water District, 2025 Annual Water Quality Report (100 percent imported supply; hardness by source). “Hardness, Total [as CaCO3] (ppm) NA NA 215 190 - 270”
- Suburban Water Systems, San Jose Hills 2024 Consumer Confidence Report (latest found). “Hardness, totaln/a 2024ppm CaCO3187.576-303214.9160-274.4”
- NOAA Technical Memorandum NWS WR-270, "Climate of San Diego" (Santa Ana winds commonly occur October to February; December most frequent). “Santa Ana winds commonly occur between October and February”
- South Coast AQMD news release, December 9, 2023 (Santa Ana gusts lift dust and soil). “gusty Santa Ana winds, which can lift dust and soil into the air”
- SCE service territory cities list (2010). “victorville villa park visalia walnut walnut park”
- CPUC, NEM page (NEM 2.0 customers stay 20 years from interconnection). “Since April 15, 2023, customers applying for interconnection have taken service on the new net billing tariff”
- CPUC, NEM page (NEM 2.0 customers stay 20 years from interconnection). “customer-generators are allowed to remain on the NEM 2.0 tariff for 20 years from the date they interconnected”
- Mejia and Kleissl (2013), "Soiling losses for solar photovoltaic systems in California," Solar Energy (UC San Diego; 186 sites, 2010). “0.81% more annual energy if they had been washed halfway through the summer drought period”
- City of Walnut, Solar Energy Systems and Inspections. “A solar panel or module array that does not exceed the maximum legal building height as defined by the Walnut Municipal Code”
- California Civil Code section 714 (california.public.law) “effectively prohibits or restricts the installation or use of a solar energy system is void and unenforceable”
Checked 2026-10-31.
Window cleaning in Walnut: get your price.
Pick your windows or panels, then make it a plan. No card needed.