Drinking Water Quality Notifications
These National Primary Drinking Water Regulations (NPDWR) apply to Public Water Systems and are found at 40 CFR 141–142. The NPDWR establish Maximum Contaminant Levels (MCLs) for six categories of contaminants:
- Microorganisms (bacteria, viruses, protozoa)
- Inorganic chemicals (naturally occurring metals and minerals)
- Synthetic organic chemicals (man-made carbon-containing chemicals)
- Volatile organic chemicals (chemicals that readily volatize, including solvents)
- Radionuclides (naturally occurring radioactive chemicals)
- Disinfection by-products (formed when disinfectants are added to water)
What Is a Public Water System (PWS)?
Public Water Systems (PWS) are systems for the provision of water for human consumption through pipes or other constructed conveyances, if that system has at least 15 service connections or regularly serves an average of at least 25 individuals for at least 60 days out of the year. [40 CFR 141.3]
Public Water Systems are required to notify their customers of any violation of the NPDWR. There are three levels (or tiers) of notification, all based on the severity of the violation.
Tier I notifications are required for violations of the NPDWR that pose some significant potential to have serious adverse effects on human health as a result of short-term exposure.
If there is a Tier I violation, the PWS must notify its recipients as soon as is practical, but no later than 24 hours after the PWS learns of the violation. The PWS must provide notice by one or more of the following methods:
- Broadcast media (local radio or television)
- Posted notices throughout the area served by the water system
- Hand delivery (door-to-door)
- Some other delivery method approved by the EPA or an authorized State agency
Tier IITier II notifications are required for violations of the NPDWR that have the potential to have serious adverse effects on human health but which don't qualify as Tier I situations (for instance, those that will only make people sick after a longer period of exposure).
If there is a Tier II violation, the PWS must notify its recipients as soon as is practical, but not later than 30 days after the PWS becomes aware of the violation. This notice must be repeated once every three months, as long as the condition causing the violation exists. The PWS must provide notice by:
- Mail or direct mail to each customer receiving a bill, and
- Any other method that will reasonably reach other persons regularly served by the system who may not be reached by mail, such as tenants in an apartment building. These methods could include publication in a daily newspaper or delivering multiple copies of the notice to a location for distribution to all residents.
Tier IIITier III notifications are required for all other violations of the NPDWR that don't meet the criteria to be considered Tier I or Tier II. If there is a Tier III violation, the PWS must notify its recipients no later than one year after learning of the violation. Notice must be repeated annually as long as the condition exists. The notice must be provided by:
- Mail or direct mail to each customer receiving a bill, and
- Any other method that will reasonably reach other persons regularly served by the PWS who may not be reached by mail, such as tenants in an apartment building. These methods could include publication in a daily newspaper or delivering multiple copies to a location for distribution to all residents.
Each notification must contain clear and readily understandable explanations of the:
- Potential adverse health effects
- Steps being taken to correct the violation
- Necessity for seeking alternate water supplies
- Preventative measures recipients should take until the violation is corrected
Master EPA Rules for Air, Water, and Chemicals
Join EHS professionals from your area at the upcoming Complete Environmental Regulations Workshop near you to learn the latest EPA rules that affect your site. Build confidence working with the complex web of air, water, and chemical requirements—including the Clean Air Act, Clean Water Act, SDWA, TSCA, EPCRA, CERCLA, FIFRA, and more.
Earn CEUs to maintain your professional certifications and get up to speed with new and changing rules, best practices, and more. Don't miss the workshop when it stops in Dallas, Little Rock, New Orleans, Houston, Las Vegas, and more. See the full schedule here.
Tags: EPA, Safe Drinking Water Act
Find a Post
The course is well thought out and organized in a way that leads to a clearer understanding of the total training.
Hazmat Shipping Professional
Lion's online training is more comprehensive, has better slides, and is a superior training experience than what I would get from other trainers.
District Environmental Manager
Much better than my previous class with another company. The Lion instructor made sense, kept me awake and made me laugh!
Enterprise Safety Manager
I can take what I learned in this workshop and apply it to everyday work and relate it to my activities.
The instructor made the class enjoyable. He presented in a very knowledgeable, personable manner. Best class I've ever attended. Will take one again.
Environmental Compliance Manager
Very witty instructor, made the long times sitting bearable. One of the few training courses I can say I actually enjoyed.
Senior EHS Engineer
Lion was very responsive to my initial questions and the website was user friendly.
Supply Chain Director
Very well structured, comprehensive, and comparable to live training seminars I've participated in previously. I will recommend the online course to other colleagues with training requirement needs.
I have attended other training providers, but Lion is best. Lion is king of the hazmat jungle!!!
Hazardous Waste Technician
I like the consistency of Lion workshops. The materials are well put together and instructors are top notch!
Permitting, Compliance & Environmental Manager
Download Our Latest Whitepaper
Four key considerations to help you maximize the convenience and quality of your experience with online training.