Water Treatment Operator Mastr

About Water Treatment Operator Mastr

Water Treatment Plant Operator is a complete offline study companion built specifically for water utility operators preparing for the ABC (Association of Boards of Certification) Class I, II, III, and IV drinking-water operator exams.

✅ 808 practice questions across 13 exam-aligned categories
✅ 8 plant-math calculator tools used on the job and on the exam
✅ Detailed answer explanations on every question — not just A/B/C/D
✅ Works fully offline once installed — no signup, no account required
✅ Free preview of every category — try before you upgrade

📚 What's covered (808 questions, exact count)
• Water Sources & Hydrology (51)
• Coagulation & Flocculation (50)
• Sedimentation & Clarification (49)
• Filtration (49)
• Disinfection (49)
• Fluoridation (40)
• Corrosion Control (39)
• Distribution Systems (48)
• Pumps & Hydraulics (49)
• Lab Procedures & Sampling (47)
• Math & Calculations (240)
• Safety (47)
• Regulations: SDWA, SWTR, IESWTR, LT2, Stage 1/2 DBPR, LCRR, GWR, RTCR, PFAS NPDWR (50)

🧮 8 built-in operator calculators
• Chemical feed rate (mg/L → lb/day)
• Detention time (volume / flow)
• Surface overflow rate (gpd/sq ft)
• Filter loading rate (gpm/sq ft)
• Pump horsepower (water HP & brake HP)
• CT disinfection (concentration × time)
• Tank volume (rectangular & circular)
• Flow & dose conversions (gpm ↔ MGD, mg/L ↔ ppm, etc.)

📖 Quick-reference cards for the field
• MCLs and action levels (lead, copper, arsenic, nitrate, fluoride, TTHM, HAA5)
• MRDLs (chlorine 4.0, ClO₂ 0.8)
• PFAS MCLs (2024 NPDWR)
• Common conversion factors (8.34 lb/gal, 7.48 gal/cu ft, etc.)
• Disinfection CT tables and Giardia/virus log-removal credits
• AWWA C651 main disinfection summary

🎯 Practice modes
• Quick Quiz (25 random questions, instant feedback)
• Category Study (focus on weak areas)
• Full Practice Exam (100 questions, 2-hour timer, 70% to pass — Pro)

📈 Track your progress
• Per-category accuracy
• Daily study streak
• Total questions answered and percent correct

💎 Pro upgrade (one-time purchase, no subscription)
• Unlocks all 808 questions in every category
• Full 100-question timed practice exam
• Removes all advertising

🛡 Privacy and safety
• No account, no email, no personal data collected
• Stats stored only on your device
• Reviewed by Google Play with verified Data Safety disclosure

📺 Advertising disclosure
The free version is supported by Google AdMob banner, interstitial, and app-open ads. Pro users see no ads.

📩 Support: [email protected]
🔒 Privacy policy: https://playstoreapps.corithmflowmatrix.com/water-treatment-plant-operator-2026/privacy_policy.html
📝 Terms of service: https://playstoreapps.corithmflowmatrix.com/water-treatment-plant-operator-2026/terms_of_service.html
🗑 Delete account / data: https://playstoreapps.corithmflowmatrix.com/water-treatment-plant-operator-2026/delete_account.html

⚠ Disclaimer
This app is an independent study aid and is not affiliated with, endorsed by, or sponsored by the Association of Boards of Certification (ABC), any state regulatory agency, or AWWA. Content is for exam preparation and continuing-education review only and is not a substitute for state-approved training, official examination materials, or professional engineering judgement. Always verify current regulatory limits with your state primacy agency and 40 CFR Parts 141–143.