GRANBURY, Texas (CBSDFW.COM) – Some Granbury residents have received blue slips of paper about water testing, but the city wants the public to know, the form titled, “Community Water Test,” did not come from the city or its water utility services.

The city tweeted Friday it has nothing to do with the notices that instruct people to fill a bottle of water for testing and then sign the slip and provide a phone number.

The city did not say who may be responsible.