Water Treatment Exam Prep 2026
Chlorine & CT Calculators
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Calculate chlorine dosage instantly. Verify CT disinfection.Convert flow rates. State-specific content for all 50 states.1000+ questions.Pass your operator certification.
WATER TREATMENT PREP: CALCULATE. VERIFY. PASS.
The only water operator exam prep app with real plant calculators. Chlorine dosage, CT disinfection, chemical feed rates — tools you'll use every day on the job.
ALL 50 STATES SUPPORTED
Select your state. Get content specific to your certification.
- California SWRCB (D1-D5, T1-T5)
- Texas TCEQ (Class A-D)
- New York DOH (Levels 1A-4A)
- Florida DEP (Class A-C)
- All other states with standard levels
Federal EPA content applies everywhere. State-specific regulations where they matter.
CHLORINE DOSAGE CALCULATOR
The #1 calculation on every exam. The tool you'll use daily at the plant.
Enter:
- Flow rate (MGD, GPM, or GPD)
- Target dose (mg/L)
- Chlorine type (gas, hypo 12.5%, calcium hypo)
Get:
- Pounds per day for gas chlorine
- Gallons per day for liquid hypo
- Step-by-step formula breakdown
lbs/day = MGD × mg/L × 8.34
Never miss a dosage calculation again.
CT DISINFECTION CALCULATOR
EPA requires adequate CT for pathogen inactivation. Calculate and verify.
Enter:
- Disinfectant residual (mg/L)
- Contact time (minutes)
- Temperature and pH
Get:
- CT value achieved
- Required CT for Giardia
- Pass/fail determination
- Log inactivation achieved
CT = Concentration × Time
Know instantly if you're compliant.
CHEMICAL FEED RATE CALCULATOR
Set your feed pumps correctly. Calculate rate from dose and flow.
Works for:
- Sodium hypochlorite
- Alum and polymers
- Fluoride
- Soda ash
- Any chemical with known strength and SG
Output in GPD, GPH, or mL/min. Calculate pump stroke percentage.
FLOW RATE CONVERTER
Water industry uses multiple units. Convert instantly.
- MGD ↔ GPM ↔ GPD
- CFS ↔ GPM ↔ MGD
- Liters per second
- Cubic meters per day
1 MGD = 694.44 GPM = 1.547 CFS
Tap any value, see all conversions.
DETENTION TIME CALCULATOR
Calculate how long water stays in tanks and basins.
Enter tank dimensions. Get volume in gallons and cubic feet. Enter flow rate. Get detention time in minutes and hours.
Works for rectangular tanks, cylindrical tanks, and pipes.
480+ PRACTICE QUESTIONS
Math & Calculations
- Dosage problems with 8.34
- Flow conversions
- Detention time
- Volume calculations
Disinfection
- CT requirements
- Chlorine chemistry
- DBP formation
- UV disinfection
Water Quality
- MCLs for all contaminants
- Sampling requirements
- Test procedures
Treatment Processes
- Coagulation and flocculation
- Sedimentation
- Filtration types
- Process troubleshooting
Plus: Distribution systems, safety, federal regulations, state regulations, operations, laboratory procedures
STATE-SPECIFIC CONTENT
California: SWRCB regulations, Title 22, D/T certification levels
Texas: TCEQ requirements, 30 TAC Chapter 290
New York: DOH regulations, Level 1A-4A system
Florida: DEP rules, Class A-C system
All states: Federal EPA requirements apply
WHO NEEDS THIS APP
- Water treatment plant operators
- Wastewater operators
- Distribution system operators
- Utility workers seeking certification
- Anyone recertifying (every 2-3 years)
175,000 operators nationwide. Aging workforce means constant new operators entering.
FREE TO START
5 questions per day free. Calculators in demo mode.
PRO - TRY FREE FOR 3 DAYS
Start your free trial. Get full access immediately.
Full access includes:
- Unlimited practice questions
- All five calculators
- State-specific content
- Exam simulator
- Progress tracking
- All reference materials
CALCULATE. VERIFY. PASS.
The exam costs $100-200. The tools pay for themselves on your first day at the plant.
This app is for educational purposes only. Certification requirements vary by state. Check with your state certifying agency for specific requirements.
Privacy Policy: https://www.voltexam.com/privacy
Terms & Conditions: https://www.voltexam.com/terms
Terms of Service: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Deeun Inc., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Deeun Inc.
- Size
- 4.9 MB
- Category
- Education
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Pro - Monthly $9.99
- Pro - Lifetime Access $24.99
- Copyright
- © VoltExam 2026