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Litigation Support
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Environmental Solutions
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The Firm
Waterstone Environmental, Inc. was formed in 1997 as a group of senior scientists and engineers applying their decades of experience as active consultants in the environmental area.
We employ a team approach and senior consultants work intimately on all aspects of each project. As a result, we believe that we have established a service-oriented company culture that provides our clients with high quality consulting and timely service.
Waterstone News
WE ARE HIRING...AGAIN!
May 2025
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It's been a busy year so far here at Waterstone, and because of it we are looking to grow our work family. We have plenty of room to expand our team and look forward to training new employees. Currently, we are looking for both entry level and senior level candidates. ​
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See details on our Careers page.
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DTSC Issues Updated HHRA HERO Note 3 Screening Levels
April 2025
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HHRA Note 3 presents recommended DTSC-modified screening levels ("DTSC-SLs") for constituents in soil, tap water, and ambient air. Derived using DTSC-modified exposure and toxicity factors, this is the newest update since May 2022. The most significant and noticeable change that occurred was the effect of the adult soil adherence factor for the industrial scenario reducing from 0.2 to 0.12 milligrams per centimeter squared (mg/cm2) in the April 2025 update of HHRA Note 1. This resulted in updates to the soil DTSC-SLs for commercial/industrial receptors in HHRA Note 3; many of the soil screening values have increased.
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Here is a link to the new HHRA HERO Note 3 Tables.
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