NSF International consensus standards cover an extensive range of products for the water and wastewater industries to help ensure the quality and safety of these products in the marketplace. Our expertise in writing standards and testing and certifying products for drinking water, plastic piping systems, recreational water and wastewater is unmatched.
Standards and protocols can provide credibility and industry acceptance for new products or emerging technologies.
Plastic Piping Systems Standards
As the most widely recognized mark in the water products industry, NSF International has the standards, qualifications and reputation to help your business meet the needs of the market and gain the recognition and acceptance that is critical to success.
Standards and protocols can provide credibility and industry acceptance for emerging technologies or new product categories.
For standard development or revision status, visit the NSF Online Workspace. Get involved with NSF standards and protocol development by joining a Joint Committee. The NSF Standards Department is seeking experts to serve on various NSF joint committees.
Standards
NSF/ANSI 14: Plastic Pipes and Fittings
NSF/ANSI 14 sets minimum physical, performance, health effects, quality assurance, marking and recordkeeping requirements for plastic piping components and related materials. NSF/ANSI 14 establishes product testing, long-term strength and quality control requirements that are key to ensuring product performance in the field.
NSF/ANSI 358-1: Pipe and Fittings for Geothermal Systems
NSF/ANSI 358-1: Polyethylene Pipe and Fittings for Water-Based Ground-Source “Geothermal” Heat Pump Systems determines the minimum physical and performance requirements for plastic system components. NSF/ANSI 358-1 establishes product testing, long-term strength and quality control requirements that are key to ensuring product performance in the field.
Why Work With NSF?
NSF is the most widely recognized and respected certification mark in the plastic piping industry. NSF’s water industry experience and background can help your organization with certification to existing standards or in developing new ones. NSF is accredited by the American National Standards Institute (ANSI) to develop American National Standards. ANSI's accreditation verifies that NSF develops standards in a manner that ensures openness and due process allowing for equity and fair play.
Drinking Water Systems Standards and Protocols
NSF led the development of American National Standards for all materials and products that treat or come in contact with drinking water, such as plumbing components, water treatment chemicals and drinking water filters, as well as pool and spa equipment to help protect public health and minimize adverse health effects.
Standards and protocols can provide credibility and industry acceptance for new products or emerging technologies.
For standard development or revision status, visit the NSF Online Workspace. Get involved with NSF standards and protocol development by joining a Joint Committee. The NSF Standards Department is seeking experts to serve on various NSF joint committees.
Standards
NSF/ANSI 60: Water Treatment Chemicals
NSF/ANSI 60 covers corrosion and scale control chemicals; pH adjustment, softening, precipitation and sequestering chemicals; coagulation and flocculation chemicals; well-drilling products; disinfection and oxidation chemicals; and miscellaneous and specialty chemicals for the treatment of drinking water. The standard addresses the health effects implications of treatment chemicals and related impurities.
NSF/ANSI 61: Drinking Water System Components
NSF/ANSI 61 sets health effects criteria for many water system products, components and materials. NSF/ANSI 61 addresses crucial aspects of drinking water system components such as whether contaminants that leach or migrate from the product/material into the drinking water are above acceptable levels in finished waters.
Residential Drinking Water Treatment Standards
NSF developed its first drinking water treatment standard in 1973. Today, we test to eight point-of-use/point-of-entry (POU/POE) drinking water treatment standards and have certified thousands of systems and components.
NSF/ANSI 372: Drinking Water System Components
NSF/ANSI 372: Drinking Water System Components — Lead Content verifies the lead content of drinking water products meets levels determined by the Safe Drinking Water Act. Products certified to NSF/ANSI 372 demonstrate compliance with lead content requirements only, while products certified to NSF/ANSI 61 Annex G demonstrate compliance with both lead content and lead leaching requirements.
Pool, Spa and Recreational Water Standards
NSF has worked with key industry stakeholders to make pools, spas and recreational water products safer since 1949. NSF/ANSI 50 covers everything from pool pumps, strainers, variable frequency drives and pool drains to suction fittings, grates, and ozone and UV systems.
Standards and protocols can provide credibility and industry acceptance for new or growing technologies and products.
For standard development or revision status, visit the NSF Online Workspace. Get involved with NSF standards and protocol development by joining a Joint Committee. The NSF Standards Department is seeking experts to serve on various NSF joint committees.
Standards
NSF/ANSI 50: Pools, Spas and Hot Tubs
NSF/ANSI 50: Equipment for Pools, Spas, Hot Tubs and Other Recreational Water Facilities was developed by a committee of experts comprised of manufacturers, public health officials and users. No other standard in the world has such complete evaluation and testing criteria.
NSF/ANSI 50 specifies requirements for the material health effects, corrosion resistance, performance, disinfection efficacy, durability testing, design and construction, marking and user instructions for many types of equipment used at a water-park, pool or spa equipment and components. The standard covers every form of pool and spa, public and private, and every component, from pumps and chemicals to suction fittings and water test devices. Equally important, NSF/ANSI Standard 50 is in a constant state of evolution, incorporating the latest product and material test methods and regulations.
Wastewater Standards and Protocols
NSF has over 40 years of experience in onsite wastewater treatment systems. We work with key industry stakeholders to develop standards and protocols that set the benchmarks for testing, product certification and inspector accreditation. Our standards deliver confidence to consumers, assurance of performance to public health officials and market access and acceptance for product manufacturers in the onsite wastewater industry.
Standards and protocols can provide credibility and industry acceptance for new products or emerging technologies.
For standard development or revision status, visit the NSF Online Workspace. Get involved with NSF standards and protocol development by joining a Joint Committee. The NSF Standards Department is seeking experts to serve on various NSF joint committees.
Standards
NSF/ANSI 350 and 350-1: Onsite Reuse Treatment Systems
NSF/ANSI Standards 350 and 350-1 establish material, design, construction and performance requirements for onsite residential and commercial water reuse treatment systems, including graywater treatment systems.
NSF/ANSI 40: Residential Wastewater Treatment Systems
NSF/ANSI 40 is a standard for residential wastewater treatment systems with rated capacities between 400 and 1,500 gallons (1,514 and 5,678 liters) per day.
NSF/ANSI 41: Non-Liquid Saturated Treatment Systems
NSF/ANSI Standard 41 certifies composting toilets and similar treatment systems that do not use a liquid saturated media as a primary means of storing or treating wastes.
NSF/ANSI 46: Water Treatment System Components
NSF/ANSI 46: Evaluation of Components and Devices Used in Wastewater Treatment Systems evaluates the performance of wastewater treatment system components and devices such as grinder pumps, septic tank effluent filters, chlorination devices and UV disinfection devices.
NSF/ANSI 245: Nitrogen Reduction
NSF/ANSI 245: Wastewater Treatment Systems - Nitrogen Reduction defines total nitrogen reduction requirements for residential wastewater treatment systems with rated capacities between 400 and 1,500 gallons (1,514 and 5,678 liters) per day.
NSF/ANSI 240: Drainfield Product Trench Sizing
NSF/ANSI 240: Drainfield Trench Product Sizing for Gravity Dispersal Onsite Wastewater Treatment and Dispersal Systems establishes minimum material, design, construction and performance requirements to evaluate dispersal drainfield products used as alternatives to traditional stone or gravel trenches.
NSF/ANSI 360: Field Performance Verification
NSF/ANSI 360: Wastewater Treatment Systems - Field Performance Verification establishes consistent site selection, sampling, laboratory analysis and data evaluation methods for obtaining field performance results for onsite wastewater treatment systems.
Protocols
NSF has developed several wastewater protocols containing customized testing criteria for validating performance and product claims. NSF wastewater protocols pertain to tissues in septic systems, incinerating toilets, solid/liquid separators and sewage sludge sterilization. Learn more about NSF wastewater protocols.
NSF P150: Tissues in Septic Systems
Protocol P150 evaluates the impact and fate of a tissue product entering a septic system. Tissues meeting the requirements of this protocol will not substantially increase sludge or scum accumulation, or substantially increase the loading of organic material and solids to the soil drain field.
NSF P157: Incinerating Toilets
NSF P157 evaluates the health and sanitation characteristics of electrical incinerating devices designed to combust toilet waste. It specifies minimum requirements for materials, design, construction, performance and cleanability.
NSF P353: Sewage Sludge Sterilization
NSF P353 establishes requirements for organically-enhanced granular fertilizer manufacturers that use sewage sludge as a replacement for water. Certification verifies that the granular fertilizer product is free of pathogens, is noncombustible and meets the pathogen reduction and metals concentration requirements for Class A conditioned sewage sludge and PFRP requirements of the 40 CFR Part 503 rule.
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Residential Drinking Water Treatment Standards
NSF developed its first drinking water treatment standard in 1973. Today, we test to seven point-of-use/point-of-entry (POU/POE) drinking water treatment standards and have certified thousands of systems and components.
The NSF POU/POE standards address the wide array of drinking water treatment technologies on the market today, including adsorptive medias, ion exchange, reverse osmosis, ceramic filters, pleated filters, ultraviolet (UV), distillation, reduction-oxidation (redox), shower filters and more.
Each NSF standard sets thorough health requirements and performance criteria for specific types of products. Contaminant reduction claims can be certified under each standard and can vary according to each water treatment technology capability. Systems that utilize more than one treatment technology may be certified under multiple standards.
Filtration
Three NSF standards cover filtration systems: NSF/ANSI 42, NSF/ANSI 53 and NSF/ANSI 401.
NSF/ANSI 42: Drinking Water Treatment Units - Aesthetic Effects
NSF/ANSI 42 establishes the minimum requirements for the certification of POU/POE filtration systems designed to reduce specific aesthetic or non-health-related contaminants (chlorine, taste, odor and particulates) that may be present in public or private drinking water.
The scope of NSF/ANSI 42 includes material safety, structural integrity and aesthetic, non-health-related contaminant reduction performance claims. The most common technology addressed by this standard is carbon filtration.
NSF/ANSI 53: Drinking Water Treatment Units - Health Effects
NSF/ANSI 53 establishes the minimum requirements for the certification of POU/POE filtration systems designed to reduce specific health-related contaminants, such as Cryptosporidium, Giardia, lead, volatile organic chemicals (VOCs) and MTBE (methyl tertiary-butyl ether), that may be present in public or private drinking water.
The scope of NSF/ANSI 53 includes material safety, structural integrity and health-related contaminant reduction performance claims. The most common technology addressed by this standard is carbon filtration.
NSF/ANSI 244: Supplemental Microbiological Water Treatment Systems – Filtration
NSF/ANSI 244 establishes minimum requirements for the reduction of microorganisms using mechanical filtration devices for supplemental treatment of microbiologically safe drinking water. Mechanical filtration devices covered by this standard are intended for use only on water supplies that have been treated to public water system standards or that are otherwise determined to be microbiologically safe, and are only intended for protection against intermittent incursions or accidental microbiological contamination of otherwise safe drinking water.
The scope of NSF/ANSI 244 includes material safety and structural integrity, similar to other NSF/ANSI drinking water treatment unit standards. Reduction claims under this standard include bacteria, viruses and cysts.
NSF/ANSI 401: Emerging Compounds/Incidental Contaminants
NSF/ANSI 401 addresses the ability of a water treatment device to remove up to 15 individual contaminants (listed below), which have been identified in published studies as occurring in drinking water. While not a public health issue, the contaminants covered in NSF/ANSI 401 have been detected in drinking water supplies at trace levels and can affect some consumers’ perception of drinking water quality. (NSF/ANSI 401 also applies to reverse osmosis (RO) water treatment.)
Prescription Drugs
- Meprobamate: a compound found in anti-anxiety drugs.
- Phenytoin: an anti-epileptic drug.
- Atenolol: a beta blocker drug.
- Carbamazepine: an anti-convulsant and mood-stabilizing drug.
- Trimethoprim: an antibiotic medication.
- Estrone: a prescription birth control drug.
Over-the-Counter Medications
- Ibuprofen: an over-the-counter pain reliever and anti-inflammatory medication.
- Naproxen: an over-the-counter pain reliever and anti-inflammatory medication.
Herbicides and Pesticides
- DEET (N,N-Diethyl-meta-toluamide): a pesticide and common active ingredient in insect repellents.
- Metolachlor: an organic compound that is widely used as an herbicide.
- Linuron: an herbicide often used in the control of grasses and weeds.
Chemical Compounds
- TCEP (Tris(2-chloroethyl)phosphate): a chemical compound used as a flame retardant, plasticizer and viscosity regulator in various types of polymers including polyurethanes, polyester resins and polyacrylates.
- TCPP (Tris(1-chloro-2-propyl) phosphate): a chemical compound used as a flame retardant.
- BPA (Bisphenol A): a chemical compound used as a plasticizer.
- Nonyl phenol: a collection of compounds often used as a precursor to commercial detergents.
Ultraviolet (UV)
NSF/ANSI 55: Ultraviolet Microbiological Water Treatment Systems
NSF/ANSI 55 establishes the minimum requirements for the certification of point-of-use/point-of-entry (POU/POE) ultraviolet (UV) systems and includes two optional classifications:
Class A systems (40 mJ/cm2) are designed to disinfect and/or remove microorganisms, including bacteria and viruses, from contaminated water to a safe level. Class A systems may claim to disinfect water that may be contaminated with pathogenic bacteria, viruses, Cryptosporidium or Giardia.
Class B systems (16 mJ/cm2) are designed for supplemental bactericidal treatment of public or other drinking water that has been deemed acceptable by a local health agency. Class B systems may claim to reduce normally occurring nuisance microorganisms.
Reverse Osmosis (RO)
NSF/ANSI 58: Reverse Osmosis Drinking Water Treatment Systems
NSF/ANSI 58 establishes the minimum requirements for the certification of point-of-use (POU) reverse osmosis systems designed to reduce contaminants that may be present in public or private drinking water.
The scope of NSF/ANSI 58 includes material safety, structural integrity, total dissolved solids (TDS) reduction and other optional contaminant reduction claims. The most common optional claims addressed by NSF/ANSI 58 include cyst reduction, hexavalent and trivalent chromium reduction, arsenic reduction, nitrate/nitrite reduction, and cadmium and lead reduction.
NSF/ANSI 244: Supplemental Microbiological Water Treatment Systems – Filtration
NSF/ANSI 244 establishes minimum requirements for the reduction of microorganisms using mechanical filtration devices for supplemental treatment of microbiologically safe drinking water. Mechanical filtration devices covered by this standard are intended for use only on water supplies that have been treated to public water system standards or that are otherwise determined to be microbiologically safe, and are only intended for protection against intermittent incursions or accidental microbiological contamination of otherwise safe drinking water.
The scope of NSF/ANSI 244 includes material safety and structural integrity, similar to other NSF/ANSI drinking water treatment unit standards. Reduction claims under this standard include bacteria, viruses and cysts.
NSF/ANSI 401: Emerging Compounds/Incidental Contaminants
NSF/ANSI 401 addresses the ability of a water treatment device to remove up to 15 individual contaminants (listed below), which have been identified in published studies as occurring in drinking water. While not a public health issue, the contaminants covered in NSF/ANSI 401 have been detected in drinking water supplies at trace levels and can affect some consumers’ perception of drinking water quality.
Prescription Drugs
- Meprobamate: a compound found in anti-anxiety drugs.
- Phenytoin: an anti-epileptic drug.
- Atenolol: a beta blocker drug.
- Carbamazepine: an anti-convulsant and mood-stabilizing drug.
- Trimethoprim: an antibiotic medication.
- Estrone: a prescription birth control drug.
Over-the-Counter Medications
- Ibuprofen: an over-the-counter pain reliever and anti-inflammatory medication.
- Naproxen: an over-the-counter pain reliever and anti-inflammatory medication.
Herbicides and Pesticides
- DEET (N,N-Diethyl-meta-toluamide): a pesticide and common active ingredient in insect repellents.
- Metolachlor: an organic compound that is widely used as an herbicide.
- Linuron: an herbicide often used in the control of grasses and weeds.
Chemical Compounds
- TCEP (Tris(2-chloroethyl)phosphate): a chemical compound used as a flame retardant, plasticizer and viscosity regulator in various types of polymers including polyurethanes, polyester resins and polyacrylates.
- TCPP (Tris(1-chloro-2-propyl) phosphate): a chemical compound used as a flame retardant.
- BPA (Bisphenol A): a chemical compound used as a plasticizer.
- Nonyl phenol: a collection of compounds often used as a precursor to commercial detergents.
Water Softeners
NSF/ANSI 44: Cation Exchange Water Softeners
NSF/ANSI 44 establishes the minimum requirements for the certification of residential cation exchange water softeners designed to reduce hardness from public or private water supplies.
The scope of NSF/ANSI 44 includes material safety, structural integrity, accuracy of the brine system and the reduction of hardness and specific contaminants from a known quality water source. The most common claims addressed by NSF/ANSI 44 are barium reduction, radium 226/228 reduction and softener performance.
Distillation Systems
NSF/ANSI 62: Drinking Water Distillation Systems
NSF/ANSI 62 establishes the minimum requirements for the certification of POU/POE distillation systems in terms of material safety, structural integrity, total dissolved solids (TDS) reduction and a product literature review.
Standard 62 also covers contaminant reduction claims including total arsenic, chromium, mercury, nitrate/nitrite and microorganisms from public and private water supplies.
Shower Filters
NSF/ANSI 177: Shower Filtration Systems – Aesthetic Effects
NSF/ANSI 177 was developed to cover the safety and performance of shower filtration products. Certification to NSF/ANSI 177 confirms your product’s material safety, structural integrity, minimum flow performance and its ability to reduce free available chlorine.
Residential Drinking Water Treatment Protocols
We have the unique ability to develop new protocols for testing and certification based on our customer’s needs. Much like traditional NSF standards, protocols are developed through a collaborative process involving a technical panel, including the product manufacturer, regulators, academicians, end users and public health experts with relevant expertise. Unlike NSF standards, however, the development phase is confidential, protecting your proprietary interests.
By creating customized testing criteria and validating performance and product claims, we provide assurance of product performance to your customers in your desired markets.
PFOS/PFOA
NSF P473: Drinking Water Treatment Units – PFOS & PFOA
NSF P473 provides manufacturers of point-of-use carbon based and reverse osmosis drinking water treatment technologies with the opportunity to validate reduction claims associated with the emerging contaminants, perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS).
PFOA and PFOS have been widely used in industrial and consumer applications such as non-stick cooking surfaces, paper and cardboard food packaging, insecticides, electronics, stain repellants, paints, plumbing tape and firefighting foam. Recognized as a risk to human health, the U.S. Environmental Protection Agency (EPA) has stated that a new lifetime of exposure health advisory has been established at 70 parts per trillion (ppt) for both PFOA and PFOS in drinking water. This EPA health advisory level was established to provide a margin of protection to all Americans as well as those who are immuno-compromised or in special populations (elderly, children).1
Manufacturers, health officials and regulators have recognized the importance of reducing PFOS and PFOA in drinking water, after epidemiological studies of workers exposed to high levels of the contaminants were reported to have shown a positive association between serum concentrations and increased cholesterol, decreased bilirubin, low birth weight, immunological effects and cancer.
Based on these requirements set in place by the U.S. EPA, NSF created P473 to prescribe specific science-based test methods to evaluate drinking water treatment devices on their ability to reduce PFOA and PFOS in drinking water.
Microcystin
NSF P477: Drinking Water Treatment Units – Microcystin
NSF P477 includes requirements for verifying that point-of-use (POU) water filters can effectively reduce microcystins (toxins produced by blue-green algae) in drinking water. These requirements include precisely testing these filters throughout and beyond the manufacturer’s recommended treatment capacity with actual microcystins at levels representing some of the highest seen in drinking water, for reduction down to the 0.3 ppb (parts per billion) level recommended by the U.S. EPA for children under 6 years of age.
Water Purifiers
NSF P231: Microbiological Water Purifiers
NSF P231 establishes minimum requirements for health and sanitation characteristics of microbiological water purifiers. The requirements are based on the recommendations of the U.S. Environmental Protection Agency's Task Force Report, Guide Standard and Protocol for Testing Microbiological Water Purifiers (1987) (Annex B).
Military Operations
NSF P248: Military Operations Microbiological Water Purifiers
NSF P248 evaluates individual small water purifiers (SWPs) to determine their effectiveness in providing microbiological purification to water from any fresh water source. SWPs tested using this protocol are intended for individual or squad-size use for emergency or short-term planned missions. This protocol does not test or verify claims of chemical contaminant removal efficiencies.
Iodine Reduction
NSF/JWPA P72: Iodine Radioisotope Reduction
NSF/JWPA P72 was developed by NSF International and the Japan Water Purifier Association (JWPA) to effectively evaluate point-of-use drinking water treatment units to ensure that they reduce all common forms of iodine in drinking water.
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