Water Stewardship Infrastructure
Rain is a resource—not runoff.
Shoalwater measures and connects stormwater infrastructure to improve basin performance and support corporate water stewardship initiatives.
We quantify how rain is captured, slowed, and returned—turning distributed Green Stormwater Infrastructure into measurable, local impact.
Rain built the Pacific Northwest. Now it can build what’s next.
A light, scalable climate-tech model for translating verified Green Stormwater Infrastructure into healthier watersheds and clearer stewardship signals.
Basin-specific
Verified GSI
Corporate-ready
Rain
Watershed Flow
Healthier Basins
Dashboard Signal
Illustrative
Basin Stewardship Index
Illustrative metrics showing how distributed GSI can be quantified at the basin level.
Stormwater Managed
18.4M gal
Basin Performance Capacity
Green Roofs + Cisterns
Capture at source
Slowing peak rainfall events
Rain Gardens
Neighborhood infiltration
Filtering runoff before it moves
Permeable Streets + Trees
Distributed basin network
Connecting local systems downstream
Basin Stewardship Index
The Basin Stewardship Index is the measurement layer for distributed Green Stormwater Infrastructure—turning captured, slowed, and retained rainfall into a shared view of basin performance.
It connects upstream systems to downstream watershed outcomes, making water stewardship visible, comparable, and easier to scale across real basins.
Where water stewardship becomes measurable.
A clearer signal for how local infrastructure contributes to healthier basin performance over time.
Why
Flooding, runoff pollution, and aging infrastructure are putting growing pressure on local watersheds & inhabitants. At the same time, water stewardship commitments are rising—but often remain disconnected from where water actually moves.
Reduce flood pressure
Slow runoff before it overwhelms local systems.
Improve water quality
Retain pollution at the source, not downstream.
Strengthen basins
Support healthier, more resilient watershed function.
GSI
Green Stormwater Infrastructure captures and filters rain where it falls. Measured and connected across a basin, these distributed systems move from low impact to high impact—creating meaningful local outcomes.
From low impact development to high impact basin performance.
Capture rain
Retain, slow, and infiltrate stormwater locally.
Retain pollution
Reduce runoff pollution and downstream loading.
Improve basin health
Translate everyday infrastructure into visible watershed benefit.
From rain to basin performance
Shoalwater turns distributed water infrastructure into a measurable system—connecting rainfall, quantification, and basin outcomes in one scalable stewardship model.
01
Capture
Rain is retained, slowed, and filtered through Green Stormwater Infrastructure.
02
Quantify
Stormwater performance is measured across verified systems.
03
Aggregate
Distributed impact is connected into basin-specific performance.
04
Improve
More managed stormwater supports healthier, more resilient watersheds.
Turn your system into measurable impact
If you already operate Green Stormwater Infrastructure, you're part of the solution—now it can be measured, connected, and amplified.
Register your system
Share basic details about your GSI installation.
Verify + quantify
We translate your infrastructure into measurable stormwater performance.
Join the basin
Your system contributes to aggregated watershed outcomes.
Generate impact signal
Your infrastructure becomes part of measurable water stewardship.
More systemsStronger basin performance
More dataClearer stewardship signal
More participationAccelerated impact
Built for participation
Shoalwater is designed for corporations, municipalities, communities, and partners who want a clearer, local pathway into measurable water outcomes.
Corporations
Advance water stewardship initiatives with measurable, local basin impact.
Municipalities
Understand and strengthen infrastructure performance across watersheds.
Communities
Contribute to and benefit from healthier local water systems.
Partners
Support scalable, performance-based stewardship built on real infrastructure.
From compliance → to performance
From isolated systems → to connected basins
From intention → to measurable outcomes
Measured stormwater managed = healthier watersheds
Built for basin performance, designed for climate-ready participation
