Splash Car Wash sent a letter to customers saying that their credit card numbers might have been compromised in a data breach affecting up to 30,000 patrons at locations in Fairfield, Cos Cob, Shelton, Greenwich, Bridgeport and West Haven.

Splash Car Wash, a company that has locations in Connecticut, is warning customers of a data breach that compromised credit card information, according to a letter from the company.

The company said the breach occured from the end of February until mid-May and has affected 1,400 costumers at six locations in Connecticut: Fairfield, Shelton, Bridgeport, West Haven and two in Greenwich.

The company is suggesting customers check their credit cards for fraudulent charges and contact their credit card companies should they find anything.

"We took immediate measures to rectify it. Hopefully people will come to see us and not worry about further breaches," CEO Mark Curtis said in the letter.

The company said computer malware that caused the breach.

Lauren Victory and Will Smith of FOX CT contributed to this story.