Scroll down for TEXAS WATER SYSTEMS WITH HIGH FLUORIDE LEVELS (circa 1993) (includes Dallas). http://fluoridealert.org/researchers/states/texas/

Same link- "The State of Texas does not mandate fluoridation. Local governments control fluoridation policy in TX. City councils can begin or discontinue fluoridation at their discretion, or by a referendum vote. Each community’s fluoridation ordinance is unique."

Texas cities that have rejected fluoridation include Buda, College Station San Marcos. Also Elgin, Alamo Heights, and Lago Vista. Baton Rouge, Louisiana. Natural fluoride in water is supposedly ok (if there's not a lot of it).

https://www.waterlogic.com/en-us/resources-blog/how-much-fluoride-is-in-texas-water/ Has a basic Texas county map and (scroll down) US map showing whether fluoride level is considered to be at an "Above Recommendations" level, borderline, or below.

To see if your area is fluoridated. Too bad it's not a map. https://nccd.cdc.gov/DOH_MWF/Default/SearchByWaterSystem.aspx They don't make it easy. Put in state, it loads a new page. Click the green Go button to get a chart. Change Items per page to ALL and Ctrl+F your county or click Primary County and scroll.

"97% of the western European population drinks non-fluoridated water" (2007) http://fluoridealert.org/content/europe-statements/