See If You’re In Our Free Water Testing Area! Enter your zip code to see if you’re in our free water testing area. Our free water test includes: Hardness minerals Iron Total Dissolved Solids Chlorine High/Low pH Enter Your Zip Code:*CommentsThis field is for validation purposes and should be left unchanged. More thorough testing can be done though Hawkins and our partner laboratory. Ask us for pricing for testing of specific contaminants.