Wastewater treatment and compliance expertise is a cornerstone consulting service for EEC. Whether performing feasibility studies, treatment design, operator training, or regulatory response, EEC's engineers bring their vast experience to both municipal and industrial wastewater projects. Examples of our capabilities include:

  • Treatment and reuse system design and energy optimization
  • Feasibility and sampling studies
  • Wastewater Treatment Plant Optimization Training
  • National pollutant discharge elimination system (NPDES) and publicly owned treatment works (POTW) compliance consulting
  • Industrial pretreatment program support and emerging contaminant issues


Collection Systems

Manhole cover

EEC has become a pioneer in the development of sewer system management plans (SSMPs) and is viewed as a national authority on developing and implementing fats, oils, and grease (FOG) control programs. EEC also developed and conducted the first grease interceptor training program in California for FOG inspectors. Examples of our capabilities include:

  • SSMP development and implementation
  • Computerized maintenance management system (CMMS) implementation
  • Geographical information system (GIS) integration
  • FOG control program development, implementation, and inspector training


Featured Projects

2.5 MGD Industrial/Municipal Wastewater Treatment System Design-Build

Industry: Oil Refinery

After conducting a comprehensive feasibility study and cost/benefit analysis, EEC designed a 2.5 million gallon per day (MGD) wastewater treatment plant at a refinery in China to meet new stringent discharge standards.

Project Highlights
  • Designed a 2.5 MGD treatment system
  • Provided turnkey feasibility study, design, equipment procurement, construction management, start-up, and operator training
  • Completed physical, chemical, and biological treatment for oil and grease, toxic organics, suspended solids, ammonia, chemical oxygen demand (COD), and biochemical oxygen demand (BOD)
  • Constructed stormwater diversion and treatment

Pretreatment Program Upgrade

Industry: Municipal Wastewater

EEC was retained by a large city in the western United States to respond to a state audit and notice of violation (NOV) that required an extensive upgrade of the City's pretreatment program. EEC is working side-by-side with the City to upgrade its legal authority, develop new local limits, issue industrial user permits, and provide inspector training.

Project Highlights
  • Pretreatment program assessment
  • Pretreatment ordinance and local limits development
  • Key program documents and procedures development
  • Industrial waste survey development and implementation
  • Significant industrial user (SIU) permit review and revision

Chemicals of Emerging Concern Study

Industry: Pharmaceutical


EEC conducted a comprehensive study of chemicals of emerging concern for a large pharmaceutical manufacturer. The study analyzed endocrine-disrupting effects of key chemicals used in the company's drug manufacturing processes. EEC investigated the potential adverse impacts of the manufacturer's effluent on the local publicly owned treatment works (POTW) processes, as well as acute and chronic impacts on the aquatic life in the POTW receiving waters. The study resulted in a phased raw material substitution and new best management practices to prevent harmful discharges.

Project Highlights
  • Chemical usage and manufacturing processes evaluation
  • Research on endocrine-disrupting effects and European Union and USEPA discharge standards requirements
  • POTW removal efficiency evaluation and projections
  • On-site treatment feasibility analysis
  • Corporate-wide raw material substitution plans

Water/Wastewater GIS Data Development and Conversion

Industry: Water Resources

EEC has been providing GIS services to the City of Santa Ana’s Water Resources Division since 2004. EEC developed a database and data entry procedure that transferred data from old water service index cards to digital data, complete with GIS representations. The partially automated database and data entry process allowed the Division to quickly enter information, reducing the time needed to enter tens of thousands of records. This water service data can now be queried in the GIS. EEC has also assisted Santa Ana in creating GIS feature classes based on existing tabular data. EEC has developed two methods for creating water or sewer laterals feature classes. These methods have a significant amount of automation which reduces the manual effort necessary to create service laterals.

Project Highlights
  • On-site GIS support
  • Geodatabase editing
  • Feature class development automation
  • Map document development
  • Software implementation and update
  • Graphical user interface development
  • Customized tool development
  • Massive data migrations

Wastewater Work Order and Asset Management System

Industry: Municipal Wastewater

EEC is in the process of developing a work and asset management system for Costa Mesa Sanitary District (CMSD). The computerized maintenance management system (CMMS) at the heart of the system is Azteca Systems’ CityWorks. The system is being developed in conjunction with an EEC-designed geographic information system (GIS), using Esri’s ArcGIS. The GIS and CMMS will be seamlessly integrated to revolutionize the way CMSD manages day-to-day operations and plans for the effective use of its wastewater collection system.

Project Highlights
  • State-of-the-art CMMS utilizing CityWorks technology
  • Seamless integration with existing wastewater collection network GIS based on industry standard data models
  • Full integration with Esri’s ArcGIS platform
  • Foundation for future system expansion that includes mobile, web, and modeling technologies

FOG Control Program Development and Implementation

Industry: Municipal Wastewater

FOG Check Up

Fats, oils, and grease (FOG) and sewer system management expertise is a cornerstone of EEC’s engineering services. EEC is nationally recognized as a leading FOG control expert and has developed, implemented, and assessed more than 20 FOG-control programs throughout the United States. The FOG-control programs have encompassed ordinance development, program management, and inspector training. Based on EEC's unique FOG-control expertise, many cities and wastewater districts turn to EEC to manage their FOG-control programs, including conducting all food service establishment (FSE) compliance inspections and preliminary enforcement actions. EEC also completed FOG characterization studies for 15 cities and wastewater districts and conducted the largest FOG control study in the country on behalf of Orange County Sanitation District and its 26 member agencies. EEC has been involved with every facet of FOG control programs, including, legal authority development, plan review, variance review, facility inspection, enforcement, permitting, and outreach/education.

Project Highlights
  • Developed more than 20 FOG control programs
  • Performed 13 FOG characterization studies involving the use of closed-circuit television (CCTV) surveillance to identify sewer-line hot spots and pinpoint FOG sources
  • Developed 12 FOG-control ordinances and FSE permitting programs
  • Conducted more than 20,000 FSE inspections, including grease interceptor and kitchen best management practices (BMPs)
  • Trained more than 400 FOG inspectors
  • Wastewater Treatment

  • Pretreatment Program

  • Chemicals of Concern

  • GIS Data Development

  • Asset Management

  • FOG Control Programs

Featured Projects - Shadow Padding

Latest News

In-Situ remediation refers to the cleanup of contamination in-place without the costly removal/ex-situ treatment of the soil and/or groundwater. In-situ remediation is often a logical choice for remediating a site due to the inherent cost savings; however, in some cases in-situ remediation is ineff...
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Office Locations

EECWorld Los Angeles OfficeLos Angeles Area Office
1 City Boulevard West Suite 1800
Orange, CA 92868
Phone: (714) 667-2300
Fax: (714) 667-2310
EECWorld Mid-Atlantic OfficeMid-Alantic Office
200 Harry S Truman Parkway, Suite 330
Annapolis, MD 21401
Phone: (410) 263-2234