What is the Water Quality in Napa, California?
Compared to other US cities, Napa water quality ranks in the middle range for contamination excluding Lead.
Most of their 26 contaminants have cancer-causing attributes.
- Chloroform is at very high levels: 85x health guidelines.
- Haloacetic acids (HAA5) are at extremely high levels: 231x health guidelines.
- Haloacetic acids (HAA9) are at extremely high levels: 603x health guidelines.
- These are both byproducts of the chlorine treatment process most water supplies go through.
Let’s look closer at what’s in Napa water.
What’s in Napa water?
Here are the top 5 chemical compounds in Napa water and what health issues they can potentially cause:
- Bromodichloromethane – Potential effect: Cancer
- Chloroform – Potential effect: Cancer
- Haloacetic acids – Potential effect: Cancer
- Radon – Potential effect: Cancer
- Total trihalomethanes – Potential effect: Cancer
These are five of the 26 contaminants analyzed by the Environmental Working Group (ewg.org).
12 of these contaminants are rated as exceeding EWG Health Guidelines.
Does Napa water have Lead contamination?
No, Napa does not currently have lead in its water. The most recent Lead samples collected from 2016 through 2018 showed concentrations of 0.0 parts per billion (ppb).
The legal limit for lead is 15 parts per billion. Being well-below this level is a good thing.
- Concentrations between 3.8 ppb and 15 ppb put a formula-fed baby at risk of elevated blood lead levels. Read more about the symptoms of Lead in water.
There is no safe level of lead for humans.
- The good news is that 99.99% of the lead can be removed.
See the What Can You Do? section below to learn how to filter out contaminants.
Where does Napa’s water come from?
Napa’s water comes from the Carneros Creek – Frontal San Pablo Bay Estuaries watershed.
There are no EPA assessed water sources in the Carneros Creek – Frontal San Pablo Bay Estuaries watershed.
Ideally, a water source would be Known, Assessed, and rated in Good condition.
Whether a water source is in Impaired or Good condition refers to the quality of these uses:
- Drinking Water
- Aquatic Life
- Fish and Shellfish Consumption
Learn more from How’s My Waterway
See below for what you can do to improve Napa’s water.
What Can You Do?
Information about water quality in Napa can be surprising.
But there are things you can do in your home to clean up your water.
To Remove Lead and Other Contaminants In Your Home:
There is one solution that beats Brita, PUR, and some whole house systems.
- It costs less per gallon.
- Needs fewer filter changes.
- And it doesn’t make your water taste weird.
- Use Berkey filters with activated carbon to filter out the majority of contaminants in Napa’s drinking water. (Berkey Light and Travel Berkey are the only types available in California.)
- To filter out 23 of the 26 contaminants, consider a Reverse Osmosis water filtration system for your house.
- These are more expensive than pitchers to purchase, but can be more effective.
- They have the benefit of filtering out heavy hitters like:
- Bromochloroacetic acid
- Bromodichloromethane – health risks in drinking water
- Chloroform – side effects
- Chromium (total)
- Dibromoacetic acid
- Dichloroacetic acid
- Haloacetic acids – chlorination byproduct*
- Hexavalent chromium – health effects
- Strontium-90 – exposure
- Total trihalomethanes – byproduct of chlorination*
- Trichloroacetic acid
*Chlorination is an effective method of disinfecting/treating drinking water. You can then use a water filter to reduce the effects of chlorination byproducts to get the safest, cleanest water possible.
In Your Community:
Contact your local government officials and put pressure on them to invest in cleaner waterways and upgraded city water filtration and treatment.
Go to: http://www.cityofnapa.org/ to find contact information for your local officials.