Membership Information

North American Producer Membership is open to companies that produce chlorine, caustic soda, or caustic potash in the United States, Canada, and Mexico. Institute members account for the majority of the U.S. production of chlorine and related alkali chemicals. The North American Producer members support the Institute with annual dues and assessments based on annual production.

North American Producer Members pay annual dues plus an annual assessment based on chlorine production and shipments for the period September 1, 2024, through August 31, 2025. The assessment rate is determined annually by the Board of Directors. For 2026, the Membership Dues are $6,050. The Assessment Rate is ¢ per short ton of chlorine gas produced and  53.080890¢ per short ton of liquid chlorine shipped.

Chlorine Packager/Bleach Producer Membership is open to companies located in North America and engaged in the packaging of chlorine and/or the production of sodium hypochlorite. In addition, Chlorine Packager and Bleach Producer members support the Institute with annual dues and assessments.

Chlorine Packager/Bleach Producer Members pay annual dues plus an annual assessment based on tons of chlorine packaged and/or ECUs consumed for the period September 1, 2024, through August 31, 2025. For 2026, the Membership Dues are $6,050. The first five largest packaging plants of any one member company are assessed at the full rate; the second five are assessed at half the rate; above 10 plants are assessed at one quarter the rate. The Chlorine Packager and ECUs Consumed assessment for 2026 is:

Overseas Producer Membership is open to companies located outside the United States, Canada, and Mexico that produce chlorine, caustic soda, or caustic potash.

For 2026, the dues are $9,830.

Associate Membership is open to all other companies with an interest in the chlor-alkali industry, including makers of equipment for producing, handling, shipping, and dispensing chlorine; salt suppliers; chlorine consumers; water and wastewater treatment facilities; pool chlorinators; and designers and builders of chlorine plants.

For 2026, the dues are $6,050.

There is a special sub-category of Associate Membership that, if eligible, the company receives a reduced membership fee:

Water and Wastewater Treatment Facilities that are municipally operated

For 2026, the dues are $915.

Any firm or corporation not eligible for Producer or Chlorine Packager/Bleach Producer membership, but who are interested in the continued development and improvement of the chlor-alkali industry; involved in supplying the chlor-alkali industry; users of its products; or producers and users of hydrogen chloride.

Emergency Response Contractors are a special sub-category of Associate Membership that, if eligible, the company receives a reduced membership fee. To qualify for this category, your company must be successfully verified by CI in accordance with the Chlorine Emergency Plan (CHLOREP) Contractor Verification Program requirements. If an emergency response contractor does not successfully pass verification and wishes to continue as a CI member, the company may do so as a regular Associate Member and pay the fee associated with that category. (Companies applying for this category should request a copy of the CHLOREP Contractor Verification Program description, which includes information about the process and requirements.)

For 2026, the dues are $655 only if the company is successfully verified per the CHLOREP Contractor Verification Program requirements.