Watershed Materials - Technology for New Concrete Blocks
The block with a smaller carbon footprint.

Sweetwater Watershed Block - Highest Sustainaiblity Profile

The sunrise hue of the Sweetwater Watershed Block comes from the warm, almost peach tone of its predominant crusher fines. Highest sustainability profile.

Sweetwater Watershed Block™

Produced in Napa, California

The Sweetwater Watershed Block is comprised of mostly rhyolitic fines from Nun’s Canyon with a touch of crushed rhyolite from the BoDean quarry, both in the Mayacamas Mountains of eastern Sonoma County. The sunrise hue of the Sweetwater Block surfaces as the warm, almost peach color of the Nun’s Canyon fines overpowers the gray basalt from Mark West Springs.  

The Sweetwater Watershed Block offers our highest sustainability profile. Significantly reduced cement - up to 50% less than ordinary concrete block - combined with higher levels of recycled post-industrial quarry byproducts places the environmental performance on the same level with the block’s beauty and regional heritage.

Nominal Dimensions: 4x8x16”, 6x8x16”, 8x8x16”, Bondbeam blocks 6” & 8” high. See detailed actual measurements here.

Dry Density: 105-110 pcf (medium-weight)

Weight: 18.5 lbs lbs per 4” block, 26.5 lbs per 6” block, 37 lbs per 8” block

Compressive Strength: 1,400 psi

Water Absorption: Less than 16 pcf

Linear Shrinkage: Less than 0.1%

Thermal Conductivity: 0.81–0.93 W/m°C

Acoustic Reduction: 40-50 dB (40 cm wall 500Hz)



The Sweetwater Watershed Block offers an improved sustainability profile compared to traditional concrete block.

  • Significantly reduces cement, an expensive and hugely polluting binder responsible for 6% of humanity's CO2 footprint
  • Contains increased amounts of recycled post-industrial quarry byproducts
  • Incorporates locally sourced, unwashed aggregate, reducing water use and diesel emissions from transportation
  • Avoids energy intensive steam curing
  • Increased density provides natural thermal mass that can offset heating and cooling needs

Product Availability

The Sweetwater Watershed Block is produced in Watershed Materials' factory in Northern California using locally sourced materials. In keeping with our commitment to environmental sustainability - and to reduce transportation costs - the Stanford Watershed Block is available within a 250 mile radius of the San Francisco Bay Area. For certain projects outside this radius, Watershed Materials can provide carbon offset credits for extended transportation.

Product Downloads