Following is a list of freeware that provides information and tools for the design, operation, and maintenance of water and wastewater treatment facilities. Before you access any software or apps, please read our disclaimer and permissions page if you haven't already done so.

Alpha Calculator
By SSI Aeration, Inc.. Helps calculate Alpha Factor for your plant based on process type or MLSS.

Arsenic Treatment Approaches (PDF)
By US Environmental Protection Agency, Office of Ground Water and Drinking Water. Slides and narrative from one of the presentations delivered in EPA's 2002 Arsenic Rule Training Sessions.

Arsenic Treatment Approaches (Powerpoint)
By US Environmental Protection Agency, Office of Ground Water and Drinking Water. Copies of the slides from one of the presentations delivered in EPA's 2002 Arsenic Rule Training Sessions.

Arsenic Treatment DVD
By US Environmental Protection Agency, Office of Ground Water and Drinking Water. Contains 6 short videos that showcase the real world application of various arsenic treatment removal technologies. To order a copy of this DVD, call 800-490-9198 and refer to EPA 816-C-05-005.

Arsenic Treatment Technology Evaluation Handbook for Small Systems
By US Environmental Protection Agency, Office of Ground Water and Drinking Water. A simple guide for selecting an arsenic treatment technology. Contains decision trees that are intended for use as an iterative tool. Users work their way through the trees a number of times, modifying preferences and system-specific circumstances.

Arsenic Virtual Trade Show
By US Environmental Protection Agency, Office of Ground Water and Drinking Water. An online resource to help water systems comply with the Arsenic Rule. Contains brief treatment technology descriptions, interactive decision trees, questions to ask engineers and vendors when choosing a treatment technology, and a searchable vendor database.

Bioassay Quick Reference Table
By California Department of Toxic Substances Control. This guide is the prototype of a project aimed at creating an index of all the standard bioassays currently being used in the scientific community. Initially includes ASTM standards.

Calculate Scaling Potential
By SSI Aeration, Inc.. Helps you calculate scaling potential of a membrane using the Langlier Saturation Index (LSI).

DOTABLES
By US Geological Survey (USGS). The DOTABLES program generates tables of dissolved oxygen (DO) saturation values and (or) salinity correction factors over ranges of temperature, pressure, and specific conductance.

Interactive Sampling Guide for Drinking Water System Operators
By US Environmental Protection Agency, Office of Ground Water and Drinking Water. As interactive CD-Rom and web site designed to support the US EPA's public drinking water sustainable infrastructure efforts. The purpose of this guide is to help drinking water system owners and operators better understand the general procedures involved in collecting Safe Drinking Water Act compliance samples. Additional sample shipping suggestions, sample tips, and sample requirements are made available within the body of this interactive guide.

MINTEQA2 (for DOS)
By US Environmental Protection Agency, Center for Exposure Assessment Modeling (CEAM). MINTEQA2 is a equilibrium speciation model that can be used to calculate the equilibrium composition of dilute aqueous solutions in the laboratory or in natural aqueous systems. The model is useful for calculating the equilibrium mass distribution among dissolved species, adsorbed species, and multiple solid phases under a variety of conditions including a gas phase with constant partial pressures. A data base is included for solving a broad range of problems without need for additional user-supplied equilibrium constants.

Mixing Evaluator
By SSI Aeration, Inc.. With this application, you can enter tank dimensions, airflow rate, and any mechanical mixer power values, and generate a report evaluating your design. The report will provide you with guidance and design recommendations based on area and volume based mixing calculations, as well as (g) velocity gradient.

Orifice Airflow Analyzer
By SSI Aeration, Inc.. Are you using an SSI Telemetry System or Pressure Monitoring System? If you are reading orifice and diffuser pressure values, and would like to know the corresponding airflow rate to that diffuser, then this Analyzer will help.

River and Stream Water Quality Model (QUAL2K)
By US Environmental Protection Agency, Exposure Assessment Branch. QUAL2K (or Q2K) is a river and stream water quality model that is intended to represent a modernized version of the QUAL2E (or Q2E) model (Brown and Barnwell 1987).

SSI Technology Portal
By SSI Aeration, Inc.. SSI Aeration offers software providing instant budgetary quotations, spec generation, technical calculators, and trouble shooting software for its products. Software includes CurveGen, SSI Instant Estimating Software, Library Catalog, SpecGen, MBBR Estimator, and Image Classifier.

Tapered Aeration Configurator
By SSI Aeration, Inc.. Configure your plug-flow reactor for tapered aeration with this application. Is your plant a candidate for tapered aeration? What are my transfer efficiencies, mixing rates and power consumption in each zone? What should I do in my Swing Zone? You can answer all of these questions and print out a design report.

Updated Arsenic Treatment Interactive Decision Tree Online
By US Environmental Protection Agency, Office of Ground Water and Drinking Water. Companion document to the "Arsenic Treatment Technology Evaluation Handbook for Small Systems."

VendInfo
By US Environmental Protection Agency, Waste Management and Research Center. Search Vendor Information (VendInfo) for information on more than 400 pollution prevention equipment, products, or services.

Vulnerability Self Assessment Software Tool (VSAT)
By Association of Metropolitan Sewerage Agencies. Provides a system for water and wastewater utilities seeking to analyze their vulnerability to both intentional threats and natural disasters. VSAT organizes data, supports vulnerability analyses, and documents the analyses for potential utility assets including physical plant, employees, knowledge base, information technology, and customers. Includes reference libraries of both potential threats and countermeasures, and provides a method for managing the information generated by security vulnerability assessments.

WATER9
By US Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS). WATER9 is a Windows based computer program and consists of analytical expressions for estimating air emissions of individual waste constituents in wastewater collection, storage, treatment, and disposal facilities; a database listing many of the organic compounds; and procedures for obtaining reports of constituent fates, including air emissions and treatment effectiveness. WATER9 is a significant upgrade of features previously obtained in the computer programs WATER8, Chem9, and Chemdat8.

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This page last updated on 2/16/17