An official website of the United States government.

EPA Disclaimers

Disclaimer of Endorsement

Mention of or referral to commercial products or services, and/or links to non-EPA sites does not imply official EPA endorsement of or responsibility for the opinions, ideas, data, or products presented at those locations, or guarantee the validity of the information provided. Mention of commercial products/services on non-EPA websites is provided soley as a pointer to information on topics related to environmental protection that may be useful to EPA staff and the public.

Copyright Status

The U.S. Government retains a nonexclusive, royalty-free license to publish or reproduce these documents, or allow others to do so, for U.S. Government purposes. These documents may be freely distributed and used for non-commercial, scientific and educational purposes. Commercial use of the documents available from the EPA websites may be protected under the U.S. and Foreign Copyright Laws. Individual documents on the EPA website may have different copyright conditions, and that will be noted in those documents.

Disclaimer of Liability

With respect to documents available from the EPA website, neither the United States Government nor any of their employees, makes any warranty, express or implied, including the warranties of merchantability and fitness for a particular purpose, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights.

Exit Disclaimer

The EXIT icon denotes that you are leaving the EPA website and entering an external link or a third-party site.

EPA's official web site is EPA has provided this link because it provides additional information that may be useful or interesting and is being provided in a manner consistent with the intended purpose of the EPA website. Please note that EPA uses third-party sites to provide EPA content already on in a different format.

EPA cannot attest to the accuracy of non-EPA information provided by these third-party sites or any other linked site. EPA is providing these links for your reference. In doing so, EPA does not endorse any non-government websites, companies or applications.

Also, please be aware that the privacy protection provided on the domain (EPA Privacy and Security Notice) does not apply to these third-party sites. To learn more about EPA and social media, please refer to our social media page.


Information from the EPA website resides on numerous computer systems funded by the Agency. The use of the EPA websites may be monitored for computer security purposes. Any unauthorized access to the EPA website is prohibited and is subject to criminal and civil penalties under federal laws including, but not limited to, Public Law 99-474, the Computer Fraud and Abuse Act of 1986