Colorado Water & Wastewater Operator Practice Tests

Colorado (the CDPHE Water and Wastewater Facility Operators Certification Board, administered day to day by the Colorado Certified Water Professionals program, CCWP) certifies operators under Regulation 100. Treatment certificates use letters that run OPPOSITE the national numbering: Class D is entry and Class A is the highest, for both water and wastewater (plus an industrial wastewater track classed by treatment process). Distribution and collection use numbers with Class 4 highest, set by population served with complexity bump-ups. Two hybrid entry certificates cover small systems: Class S (treatment plus distribution or collection, systems serving 3,300 or fewer) and Class T (transient groundwater systems under 100 people using non-gaseous chlorine only). All exams except S and T are the standardized WPI exams, taken electronically at PSI test centers or by remote online proctoring, year-round, with a 180-day eligibility window per application, 70 percent to pass, $50 application plus a $104 exam fee. S and T use Colorado-written exams built on the WPI Class 1 and Very Small Water System criteria. Before any exam or renewal you must complete the free Mandatory Regulatory Training (MRT), valid three years. Testing is strictly sequential: D to C to B to A (and 1 to 2 to 3 to 4), no skipping, waived only for reciprocity. The ladder: entry classes need just one month of experience (or an approved week-long training course instead); Class C/2 requires the certificate below plus two years; B/3 three years; A/4 four years. Postsecondary education substitutes for up to half the experience (30 semester hours equals a year), water and wastewater experience cross-count up to half, and entry-level experience can be met entirely through training. Certificates renew every three years on training units: 1.2 TUs for entry classes up to 3.0 for Class A/4 (one TU is ten contact hours), at least half in your certificate's category, no carryover. Expired certificates can be restored for two years, then it is automatic revocation and you start over. Facilities must have a certified operator in responsible charge at or above the facility's class, and owners operating without one face a $300 per day civil penalty. Reciprocity (Board Policy 13-1) can grant a certificate without examination if your out-of-state exam was Colorado-approved and passed at 70 percent.

No. These are independent practice tests designed to mirror the technical material and difficulty of the Colorado certification exam. The official exam is administered by CDPHE Water and Wastewater Facility Operators Certification Board (CCWP program) (or its testing vendor) and the exact questions are not public.

Yes. Every practice test on this site is 100% free, and always will be. To keep it that way, the site may feature sponsors or offer optional paid resources like study courses, but the practice tests themselves stay free.