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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.

Latest Insights

Reporting Frequency Changes for HMBP

July 2019

AB 1429 changes the required reporting frequency for hazardous materials handlers not required to submit Tier II information pursuant to the federal Emergency Planning and Community Right to Know Act (EPCRA) and not subject to the requirements of the Aboveground Petroleum Storage Act (APSA).

A brief summary of the changes has been prepared by the Governor's Office of Emergency Services.

HHRA Note 10 and ITRC's TPH Risk Evaluation Web Document

March 2019

On September 4, 2018 the Toxicity Criteria for Human Health Risk Assessments, Screening Levels, and Remediation Goals rule (hereafter “Rule”) was approved by the State of California Office of Administrative Law and became effective immediately. In February 2019, DTSC HERO issued a new HHRA Note to address the specification of promulgated criteria and address the recommendation and approval of recommended criteria. 

Regarding TPH Risk Evaluation, HHRA Note 10 recommends consulting the ITRC TPH Risk Evaluation at Petroleum-Contaminated Sites guidance document.

Amendment to the Industrial General Permit

July 2019

The new amendment to the General Permit for Stormwater Discharges associated with Industrial Activities in the State of California will likely become effective on July 1, 2020. This amendment includes a list of impaired water bodies and the Total Maximum Discharge Limits (TMDLs) that will apply to stormwater dischargers within those watersheds. You can check if your facility is located within an impaired body watershed with the online mapping tool.

Waterstone News

LA County Bar Association - Environmental Law Fall Symposium

November 2019

Thanks for coming out to see Waterstone at the 18th Annual Environmental Law Fall Symposium.  This year’s Fall symposium offered three panels focused on: (1) A science and legal update on “Forever Chemicals” such as Per- and polyfluoroalkyl substances 

(PFAS), (2) The future of alternative fuel transportation, (3) AB 617 California’s new nonvehicular air pollution criteria. 

We'll see you again in Spring 2020.