Source check: 2026-10-04. Shared WPI courses are linked only where the standardized exam and class match are confirmed. Local grades may not equal WPI class numbers. Your authority's current documents control.
Dedicated prep not yet available
Program authority: Colorado Water and Wastewater Facility Operators Certification Board (WWFOCB); administered through Colorado Certified Water Professionals (CCWP)
Local levels: Water Treatment Class D (entry), Class C, Class B, Class A (most advanced); Small Water System Class S (hybrid treatment/distribution). Official study page also identifies a custom Class T water exam, but its precise certification privileges were not established.
The state expressly identifies WPI standardized sequential exams for ordinary certificate classes, with custom Classes S and T exceptions. Class S can cover Class D treatment for systems serving fewer than 3,300 persons. No explicit Colorado D/C/B/A-to-WPI I/II/III/IV crosswalk was found in the acquired sources; shared levels therefore remain unverified. The custom exceptions are not standardized WPI exams; their writer is not expressly identified.
No state-matched course is linked for this stream yet.
Colorado uses 'standardized, sequential examinations developed by Water Professionals International (WPI) for all classes of certificates, except Classes “S” and “T” which are custom exams.' It separately identifies custom Colorado Small Water System and Class T exams.
Lists Water Treatment Classes D, C, B, A. Describes Small Water System Class S as a hybrid certificate permitting responsible charge of Class D treatment and/or Class 1 distribution below 3,300 persons.
WWFOCB maintains certification for operators of water treatment plants, municipal and industrial wastewater treatment plants, water distribution systems and wastewater collection systems.
Dedicated prep not yet available
Program authority: Colorado Water and Wastewater Facility Operators Certification Board (WWFOCB); administered through Colorado Certified Water Professionals (CCWP)
Local levels: Wastewater Treatment Class D (entry), Class C, Class B, Class A (most advanced). Separate Industrial Wastewater Treatment D, C, B, A certificates are also listed. Small Wastewater System hybrid certificate is offered; its class letter was not explicitly stated in the opened category description.
The official all-classes statement verifies standardized WPI exams for ordinary treatment certificates; the Small Wastewater System exam is explicitly custom and combines treatment/collection study criteria. No explicit D/C/B/A-to-WPI I/II/III/IV crosswalk was acquired, including for the separate industrial category. Do not equate its hybrid privileges with taking a standardized Class I exam.
No state-matched course is linked for this stream yet.
States WPI standardized sequential exams for all classes except custom S/T. Specifically calls the Colorado Small Wastewater System exam custom and recommends WPI Standardized Wastewater Treatment Class I and Wastewater Collection Class I criteria.
Lists wastewater treatment D/C/B/A and separate industrial wastewater treatment D/C/B/A certificates. Small Wastewater System hybrid certification can cover Class D wastewater treatment and/or Class 1 collection below 3,300 persons.
Explicitly includes municipal and industrial wastewater treatment plants in WWFOCB's certification program.
Dedicated prep not yet available
Program authority: Colorado Water and Wastewater Facility Operators Certification Board (WWFOCB); administered through Colorado Certified Water Professionals (CCWP)
Local levels: Distribution Class 1 (entry), Class 2, Class 3, Class 4 (most advanced); Small Water System Class S (hybrid treatment/distribution).
Distribution Classes 1–4 fall within the state's explicit all-classes WPI standardized scope; the Class S alternative is custom. The acquired pages do not explicitly pair each Colorado numbered class with a WPI exam class, so shared-level correspondence is conservatively unverified. Class T distribution privileges were not established.
No state-matched course is linked for this stream yet.
States that all certificate classes use WPI standardized sequential examinations except custom Classes S and T. For the custom Small Water System exam, recommends both WPI Standardized Water Treatment Class I and Water Distribution Class I criteria.
Lists Distribution Classes 1, 2, 3, 4; Class S can cover a Class 1 distribution system serving fewer than 3,300 persons.
Explicitly includes water distribution systems in WWFOCB's operator certification program.
Dedicated prep not yet available
Program authority: Colorado Water and Wastewater Facility Operators Certification Board (WWFOCB); administered through Colorado Certified Water Professionals (CCWP)
Local levels: Collection Class 1 (entry), Class 2, Class 3, Class 4 (most advanced); Small Wastewater System hybrid certificate (class letter not explicit in opened category description).
Collection Classes 1–4 fall within the explicit all-classes WPI standardized scope; the hybrid Small Wastewater System alternative uses a custom exam. An explicit local-class-to-WPI-exam-class correspondence was not acquired, so shared levels remain unverified despite matching numeric local names.
No state-matched course is linked for this stream yet.
Explicit all-classes WPI standardized statement has S/T custom exceptions. Independently identifies the custom Small Wastewater System exam and its Wastewater Collection Class I plus Wastewater Treatment Class I study references.
Lists Collection Classes 1, 2, 3, 4 and describes the Small Wastewater System hybrid's Class 1 collection privileges for systems serving fewer than 3,300 persons.
Explicitly includes wastewater collection systems in WWFOCB's certification program.
Dedicated prep is not available or being sold yet.