Ledgestone is about 253 lots in north Kuna off Stroebel and Moon Shadow, with a 2,000-foot pathway following Mason Creek. As with the siding here, the creek splits the subdivision into two different flatwork problems, and the creekside one is a safety issue rather than a cosmetic one.
Mason Creek is real drainage, and the homes along the pathway live with standing humidity. Concrete that stays damp and sits in shade grows algae and a thin biofilm, which appears as dark green-black staining and is genuinely slippery when wet. On a front walk, a patio or the pathway itself, that is a slip hazard rather than an appearance problem, and it is the single most worthwhile flatwork job on a creekside Ledgestone lot.
High pressure removes the visible algae layer and leaves the organism in the pores, so it re-establishes from what remains and comes back faster each season, with each cleaning buying less time than the last. A solution that kills the growth resets that. On a creekside lot the underlying condition, humidity plus shade, does not change, so these homes need a rhythm regardless, but properly killed growth takes far longer to return and the surface stays non-slip longer.
Two streets in from the pathway there is no creek influence, and that flatwork carries what new Kuna subdivisions carry: wind-blown soil ground into the pores, canal-iron rust where sprinklers reach, and construction grit from streets still finishing. No growth, no slip issue, longer interval. Same HOA, two genuinely different services, which is why we quote the property rather than the subdivision.
Untreated Boise-Kuna canal water carries dissolved iron, and where overspray lands on concrete and evaporates the iron oxidises into orange-brown staining bonded into the pores, which pressure alone does not lift and which needs a rust-specific treatment. With build-out scheduled to complete around 2025 to 2026, some Ledgestone aprons also carry mortar droppings, tyre marks and tracked cement slurry, which are spot treatments rather than part of a general pass.
Pressure washing is $0.20 per square foot of actual flatwork area, measured on site, and lots from 0.126 to 0.239 acres carry conventional driveways and patios. Siding is a different service: house washing at $0.18 per square foot as a soft wash. On creekside homes that distinction matters especially, because high pressure on siding drives water behind the laps into a wall that is already slow to dry, which is the condition growing algae on the wall in the first place.
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It is growth. If you back onto the Mason Creek pathway, humidity keeps shaded concrete damp, and damp shaded concrete grows algae and biofilm. It is genuinely slippery when wet, so it is a slip hazard rather than an appearance problem.
That removes the visible layer and leaves the organism in the pores, so it re-establishes and returns faster each season, with each cleaning buying less time than the last. A solution that kills it resets that and keeps the surface non-slip much longer.
Slower if killed properly. The underlying condition, creek humidity plus shade, does not change, so creekside homes here need a rhythm regardless. But killed growth takes far longer to re-establish than displaced growth does.
No creek influence. Interior Ledgestone flatwork carries ordinary soiling instead: wind-blown soil ground into the pores, canal-iron rust where sprinklers reach, and construction grit. No growth, no slip issue and a longer interval.
Rust from iron dissolved in the untreated canal water. Where overspray evaporates on concrete the iron oxidises and bonds into the pores, so it is a chemical stain rather than dirt. It needs a rust-specific treatment rather than more pressure.
Not on a creekside home especially. High pressure drives water behind the laps into a wall already slow to dry in the humidity, which is exactly the condition growing algae on the wall. Siding is a soft wash at $0.18 per square foot, quoted separately.
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