Walnut Creek, California · 11 years in business
Exterior cleaning crews handling concrete, grease, gum, and graffiti for Walnut Creek businesses.
Everything below this line — the compliance file, operational scorecard, proof-of-work records, dispute protocol, and credentialed reviews — is generated sample content that illustrates the WashAttest record format. It is not real data about Onyx Power Wash. This business is not yet in our directory, so no real data exists for it on this page.
Sample record snapshot
Verified Sep 28, 2026
Trailing 12 months
Attached to this listing
All resolved
Each document is checked against the issuing source and re-verified at renewal. An expired or missing item stays visible on the record.
General liability insurance
Nationwide — $1M / $2M aggregate
verified
Expires Jan 16, 2027
Workers' compensation
Nationwide — statutory limits, 24 employees covered
verified
Expires Sep 13, 2027
Business license
State contractor registration No. 875654
verified
Expires Apr 8, 2027
Stormwater / NPDES permit
State general permit for exterior cleaning discharge
verified
Expires May 21, 2027
OSHA safety program
Documented training program, 2 recordable incidents in 12 months
verified
No expiry on file
Water reclamation and discharge
Trailing 12 months, drawn from 94 documented visits. These are the numbers a star rating hides.
Arrived within the agreed service window
Visits requiring a return trip
Median time to first reply
Documented nightly capacity
Contracts renewed at term
Recordable incidents per 1,000 visits
Documentation attached to this listing and reconciled against billing, so a claim about work performed can be checked rather than taken on faith.
Timestamped photo pairs captured at the start and end of each scheduled visit, retained for 24 months.
Per-visit log recording date, unit identifiers, services performed, and the crew on site.
Current certificate naming the required additional insured, re-verified at each renewal.
Record of water recovered, method used, and discharge destination for each wash event.
A business can answer a review with evidence. The record shows the claim, the response, the evidence, and the outcome — including when the review was upheld.
No disputes have been filed against this listing.
25 of 32 reviews come from a verified operator role. Roles on this listing: Property manager, Building engineer, Shopping center manager, Store manager, Retail operations manager, Facility manager, Restaurant owner.
Gordon C.
Property manager
Oct 16, 2026
They removed oil stains from our storefront that I thought were permanent. They sealed the concrete after cleaning it.
Commercial Pressure Washing · Walnut Creek, California · via Direct
Gavin G.
Building engineer
Oct 15, 2026
They cleaned the apartment breezeway and the drive-thru lane at our Walnut Creek location. The sidewalk is no longer a slip hazard.
Commercial Pressure Washing · Walnut Creek, California · via Google
Cara V.
Shopping center manager
Oct 14, 2026
Our brewery patio in Walnut Creek had not been cleaned in years. They worked overnight so we did not lose a single hour of business.
Commercial Pressure Washing · Walnut Creek, California · via Google
Tyler N.
Property manager
Sep 10, 2026
Average service. The invoice did not match the original quote. They did not cover the landscaping and some plants were flattened.
Commercial Pressure Washing · Walnut Creek, California · via Direct
Beth Z.
Store manager
Aug 30, 2026
Our church parking lot in Walnut Creek had a layer of grime that nothing else touched. The sidewalk is no longer a slip hazard.
Commercial Pressure Washing · Walnut Creek, California · via Google
Leo W.
Retail operations manager
Aug 1, 2026
The school walkway was slick with grease and now it is safe to walk on. No runoff issues — they handled the water properly.
Commercial Pressure Washing · Walnut Creek, California · via Google
Landon F.
Facility manager
Jul 31, 2026
We had them out to our Walnut Creek location for the sidewalk and the loading area. They used hot water and a degreaser that actually worked.
Commercial Pressure Washing · Walnut Creek, California · via Yelp
Ethan A.
Shopping center manager
Jun 25, 2026
Booked commercial pressure washing in Walnut Creek and they handled the water and permits. They worked overnight so we did not lose a single hour of business.
Commercial Pressure Washing · Walnut Creek, California · via Google
Jill L.
Building engineer
Jun 24, 2026
Booked commercial pressure washing for our office building entrance in Walnut Creek. Our inspection passed with zero cleaning-related notes.
Commercial Pressure Washing · Walnut Creek, California · via Yelp
Adriana O.
Store manager
Apr 27, 2026
Our retail center needed degreasing before the health department visit. Very good work overall, though the noise during business hours was a factor.
Commercial Pressure Washing · Walnut Creek, California · via Yelp
Marina W.
Property manager
Apr 22, 2026
They cleaned our shopping center walkway and the concrete looks new. Very good work overall, though the noise during business hours was a factor.
Commercial Pressure Washing · Walnut Creek, California · via Facebook
Rosa C.
Facility manager
Mar 31, 2026
The drive-thru lane at our facility was embarrassing before they came out. Only knocking a star because the start time slipped by an hour.
Commercial Pressure Washing · Walnut Creek, California · via Facebook
Kurt H.
Restaurant owner
Mar 10, 2026
They pressure washed the medical plaza sidewalk and the dumpster area in one visit. The concrete came out several shades lighter.
Commercial Pressure Washing · Walnut Creek, California · via Direct
Miles W.
Facility manager
Mar 1, 2026
I manage the property and hired them for the sidewalk in Walnut Creek. Only knocking a star because the start time slipped by an hour.
Commercial Pressure Washing · Walnut Creek, California · via Google
Cara B.
Facility manager
Feb 28, 2026
They handled the gas station canopy at our Walnut Creek location overnight so we never closed. They used the right pressure so nothing was damaged.
Commercial Pressure Washing · Walnut Creek, California · via Google
Dawn E.
Building engineer
Nov 22, 2025
Our office building entrance needed degreasing before the health department visit. No damage to the paint, signage, or landscaping.
Commercial Pressure Washing · Walnut Creek, California · via Yelp
Rita M.
Property manager
Nov 4, 2025
They did the work, but the crew arrived well outside the window. The dumpster pad still had grease on it.
Commercial Pressure Washing · Walnut Creek, California · via Google
Dwayne J.
Shopping center manager
Oct 30, 2025
Our dumpster pad was a grease magnet — not anymore. The grease trap area finally does not smell.
Commercial Pressure Washing · Walnut Creek, California · via Yelp
Brandon C.
Retail operations manager
Oct 24, 2025
We had our storefront pressure washed before a health inspection in Walnut Creek. Our customers noticed the difference the same day.
Commercial Pressure Washing · Walnut Creek, California · via Google
Alexis M.
Store manager
Oct 1, 2025
Our warehouse apron in Walnut Creek is now part of our monthly maintenance. No damage to the paint, signage, or landscaping.
Commercial Pressure Washing · Walnut Creek, California · via Facebook
Trevor M.
Facility manager
Sep 28, 2025
Our brewery patio was a grease magnet — not anymore. Reliable crew. The invoice took a while to arrive.
Commercial Pressure Washing · Walnut Creek, California · via Google
Quentin B.
Store manager
Sep 27, 2025
We hired them for the storefront and ended up adding a recurring contract. They came back to touch up an area at no charge.
Commercial Pressure Washing · Walnut Creek, California · via Yelp
Grace N.
Property manager
Sep 22, 2025
They worked around our business hours in Walnut Creek without a single complaint. The sidewalk is no longer a slip hazard.
Commercial Pressure Washing · Walnut Creek, California · via Yelp
Colin V.
Property manager
Sep 19, 2025
The grocery store sidewalk at our Walnut Creek site had a black film of grime on it. They worked overnight so we did not lose a single hour of business.
Commercial Pressure Washing · Walnut Creek, California · via Google
Kelsey G.
Building engineer
Sep 13, 2025
They cleaned our school walkway and the concrete looks new. The gum removal alone was worth the price.
Commercial Pressure Washing · Walnut Creek, California · via Google
Malik F.
Building engineer
Aug 28, 2025
They came out to our Walnut Creek property and cleaned the warehouse apron top to bottom. Good result overall. One section of the lot needed a second pass.
Commercial Pressure Washing · Walnut Creek, California · via Google
Amber B.
Shopping center manager
Aug 20, 2025
They removed oil stains from our apartment breezeway that I thought were permanent. Solid work. The quote came in slightly above what I expected.
Commercial Pressure Washing · Walnut Creek, California · via Google
Jonah W.
Restaurant owner
Aug 2, 2025
Our gas station canopy had years of gum, oil, and grime built up. Only knocking a star because the start time slipped by an hour.
Commercial Pressure Washing · Walnut Creek, California · via Google
Marisol B.
Property manager
Jul 30, 2025
They cleaned the shopping center walkway and the drive-thru lane at our Walnut Creek location. Very good work overall, though the noise during business hours was a factor.
Commercial Pressure Washing · Walnut Creek, California · via Google
Kyle B.
Building engineer
Jun 22, 2025
They cleaned the loading dock at our Walnut Creek location before we opened for the day. They sealed the concrete after cleaning it.
Commercial Pressure Washing · Walnut Creek, California · via Google
Jasmine E.
Store manager
Jun 2, 2025
Our dealership lot had rust stains and graffiti — both gone. No runoff issues — they handled the water properly.
Commercial Pressure Washing · Walnut Creek, California · via Google
Tyler M.
Shopping center manager
May 15, 2025
Disappointing outcome for the price. We were billed for work that was not performed.
Commercial Pressure Washing · Walnut Creek, California · via Google
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Walnut Creek, California
Commercial pressure washing for storefronts, lots, and dumpster pads across Walnut Creek.
Walnut Creek, California
Scheduled commercial pressure washing built around your operating hours.
Walnut Creek, California
Scheduled commercial pressure washing built around your operating hours.