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how-to-choose-water-filtration-system-for-municipal-use-in-the-us-everfilt

How to Choose a Water Filtration System for Municipal Use In the U.S.?

Choosing a water filtration system for a municipal water treatment application requires balancing water quality goals, regulatory compliance, operating costs, and long-term reliability.

Unlike industrial systems, municipal systems must consistently meet federal and state drinking water standards while serving large populations.

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how-to-choose-water-filtration-system-for-municipal-use-in-the-us-everfilt
Step 1: Understand Your Source Water

The source water drives the treatment process design. 

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Surface Water (Rivers, Lakes, Reservoirs)

Common contaminants:​​​​

  • Turbidity

  • Suspended solids

  • Algae

  • Natural organic matter (NOM)

  • Bacteria & viruses

  • Seasonal water quality fluctuations

Typical treatment train:​​​​

  • Intake screening

  • Coagulation/flocculation

  • Clarification

  • Media filtration

  • Disinfection

Groundwater (Wells)

Common contaminants:​​​​

  • Sand & sediment

  • Iron & manganese

  • Hardness

  • Arsenic

  • Nitrates

  • Radionuclides (in some regions)

Typical treatment train:​​​​

  • Sand separation

  • Filtration

  • Specialty treatment (if required)

  • Disinfection

Step 2: Determine Regulatory Requirements

Municipal drinking water systems must comply with regulations established by the U.S. Environmental Protection Agency under the Safe Drinking Water Act.

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Key requirements may include:

  1. Turbidity limits

  2. Total coliform requirements

  3. Disinfection byproduct limits

  4. Arsenic standards

  5. Lead and copper regulations

  6. PFAS treatment requirements (where applicable)

Designing around regulatory compliance is often the first priority.

how-to-choose-water-filtration-system-for-municipal-use-in-the-us-everfilt
Step 3: Define Treatment Objectives

Objective

Common Technology

  1. Turbidity »

  2. Algae removal »

  3. Iron & manganese removal »

  4. Taset & odor control »

  5. PFAS reduction »

  6. Organic removal »

  7. Pathogen control »

  8. Nitrate removal »

  9. Arsenic removal »

  1. Multimedia filtration

  2. Clarification + media filtration

  3. Oxidation + filtration

  4. Granular activated carbon (GAC)

  5. GAC or ion exchange

  6. Enhanced coagulation + GAC

  7. UV and/or chemical disinfection

  8. Ion exchange or RO

  9. Adsorptive media or coagulation

Step 4: Select the Appropriate Filtration Technology

Multi-Media Filters

Best for:​​​​

  • Turbidity reduction

  • Surface water treatment

  • Pretreatment ahead of membranes

Advantages:​​​​

  • Proven municipal technology

  • High solids loading capacity

  • Reliable operation

  • Lower operating costs

Granular Activated Carbon (GAC)

Best for:​​​​

  • PFAS treatment

  • Taste & odor removal

  • Organic contaminant reduction

Advantages:​​​​

  • Widely accepted by regulators

  • Effective for many emerging contaminants

  • Improves finished water quality

DMI-65® Filtration

Best for:​​​​

  • Iron & manganese removal

  • Arsenic removal

  • Heavy metals & hydrogen sulfide

Advantages:​​​​

  • No potassium permanganate

  • High flow rate capability

  • Continuous operation & self-regenerating

Wedge Wire Screen Filtration

Best for:​​​​

  • Sprinkler irrigation

  • Pivot irrigation

  • Final polishing for drip systems

Advantages:​​​​

  • Simple operation

  • Low maintenance

  • Precise filtration ratings

  • Lower initial cost

how-to-choose-water-filtration-system-for-municipal-use-in-the-us-everfilt
Step 5: Size of Current & Future Demand

Municipal systems are generally designed based on:

  • Average daily demand (ADD)

  • Maximum daily demand (MDD)

  • Peak hourly demand (PHD)

  • Fire flow requirements

  • Future population growth

Many municipalities design for 20 – 30 years of anticipated growth.

Step 6: Consider Lifecycle Costs

Evaluate:

  • Capital costs

  • Energy consumption

  • Media replacement

  • Chemical consumption

  • Backwash water usage

  • Operator requirements

  • Spare parts availability

The lowest initial cost rarely produces the lowest long-term operating cost.

how-to-choose-water-filtration-system-for-municipal-use-in-the-us-everfilt
Step 7: Automation & Monitoring

Modern municipal systems typically include:

  • PLC controls

  • SCADA integration

  • Remote monitoring

  • Automatic backwash controls

  • Water quality monitoring

  • Regulatory reporting capability

These features improve reliability and simplify compliance.

Typical Municipal Treatment Configurations

Conventional Surface Water Plant:

  • Screening

  • Coagulation

  • Flocculation

  • Clarification

  • Multi-media filtration

  • Disinfection

  • Distribution

Groundwater Treatment Plant:

  • Sand separation

  • Oxidation (if required)

  • Media filtration

  • GAC (if required)

  • Disinfection

  • Distribution

PFAS Treatment Upgrade:

  • Existing filtration

  • GAC adsorption or ion exchange

  • Monitoring

  • Distribution

Membrane-Based Plant:

  • Pretreatment

  • Ultrafiltration

  • Optional RO

  • Disinfection

  • Distribution

Key Questions Before Selecting Equipment:

  1. What is the source water?

  2. What is the design flow rate (MGD or GPM)?

  3. What contaminants must be removed?

  4. Are PFAS, arsenic, iron, manganese, or nitrates present?

  5. Is the system new construction or a retrofit?

  6. What state regulatory requirements apply?

  7. What level of automation is desired?

For many municipal projects in the U.S., multi-media filtration remains the most common filtration technology due to its proven performance, relatively low operating cost, and ability to integrate with clarification, GAC, and disinfection systems. For communities facing PFAS concerns or stricter pathogen requirements, GAC and membrane systems are increasingly being incorporated into new treatment plant designs.

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