Renton, Washington: Lovely Sewage Plant Grotto

Artistic environments along pleasant trails on top of what otherwise would be just a water treatment plant.

Waterworks Garden

1200 Monster Rd Southwest, Renton, WA
Waterworks Garden, next to King County's South Treatment Plant.
Save to My Sights

Visitor Tips and News About Lovely Sewage Plant Grotto

Reports and tips from visitors and Roadside America mobile tipsters. Some tips may not be verified. Submit your own tip.

Mosaic grotto.

Water Treatment Plant Grotto

A very detailed stone and marble mosaic grotto designed by an artist. Part of the Waterworks Park in Renton WA. Built by King Co. Water treatment plant.

[Michael Anway, 12/15/2008]

Open since 1996, there's also a bit of a monolith/henge arrangement. The beautiful public sculptures are artfully dappled among algae-covered ponds filtering stormwater....

Nearby Offbeat Places

Office Park StonehengeOffice Park Stonehenge, Renton, WA - 1 mi.
U-Haul Space NeedleU-Haul Space Needle, Renton, WA - 2 mi.
Rooftop DragonRooftop Dragon, Renton, WA - 2 mi.
In the region:
Archie McPhee Catalog Store, Seattle, WA - 14 mi.

Latest Tips Across Roadside America

Catch up on the latest discoveries from the road.

Explore Thousands of Oddball Tourist Attractions!

Unique destinations in the U.S. and Canada are our special obsession. Use our attraction recommendation and maps to plan your next road trip.

January 19, 2020

My Sights

My Sights

Map and Plan Your Own Roadside Adventure

Try My Sights

Roadside America app
Roadside Presidents app

Washington Latest Tips and Stories

Latest Visitor Tips

Sight of the Week

Sight of the Week

Nike Missile Site SF-88L, Mill Valley, California (Jan 13-19, 2020)

SotW Archive

USA and Canada Tips and Stories

More Sightings

Sightings. Arrives without warning. Leaves no burn marks. A free newsletter from Subscribe now! Hotel & Motel Finder

Special rates for hotels.

Nearby Hotels: Renton, Washington

Nightly rates found:

Book Now


Favorite Quirky City Sights