La Mesa, California

What is the Water Quality in La Mesa, California?

[Updated: June 9, 2023]

Compared to other US cities, La Mesa water quality ranks in the lower range for contamination excluding Lead.

Most of their 11 contaminants have cancer-causing attributes.

• Haloacetic acids (HAA5) are at extremely high levels: 77x health guidelines.
• Haloacetic acids (HAA9) are at extremely high levels: 284x health guidelines.
  • HAA5 and HAA9 are byproducts of chlorine treatment, a common method of disinfecting water supplies.

Let’s look closer at what’s in La Mesa water.

What’s in La Mesa water?

Here are the top 3 chemical compounds in your water and what health issues they can potentially cause:

1. Haloacetic acids (HAA5) – Potential effect: Cancer
2. Haloacetic acids (HAA9) – Potential effect: Cancer
3. Total trihalomethanes – Potential effect: Cancer

These are three of the 11 contaminants analyzed by the Environmental Working Group (ewg.org).

These 3 contaminants are rated as exceeding EWG Health Guidelines.

Does La Mesa have Lead contamination?

No, La Mesa 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 filtered out.

See the What Can You Do? section below to learn how to filter out contaminants.

Where does La Mesa’s water come from?

La Mesa’s water comes from the Chollas Creek watershed.

Both water sources in the Chollas Creek watershed are in Impaired or Unknown condition. These are:

• Chollas Creek
• San Diego Bay Shoreline, near Chollas Creek

Ideally, a water source would be rated in Good condition.

Learn more from How’s My Waterway

See below for what you can do to improve La Mesa’s water.

What Can You Do?

Information about water quality in La Mesa 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:

• Use Activated Carbon filters to remove most contaminants in your drinking water.
  • Faucet-mount filters work better than pitchers.
  • PUR and Brita are low-cost and effective.

• To filter out even more contaminants in your whole house, consider a Reverse Osmosis water filtration system for your home.
  • These are more expensive than pitchers to purchase, but are much more effective.
  • They have the benefit of filtering out heavy hitters like:
    • Bromochloromethane
    • Chromium (total)
    • Haloacetic acids (HAA5)
    • Haloacetic acids (HAA9)
    • Hexavalent chromium
    • Molybdenum
    • Strontiun
    • Total trihalomethanes
  • Our recommendation: APEC Reverse Osmosis Systems

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: https://www.cityoflamesa.us/ to find contact information for your local officials.

Water Quality in Other California Cities

California Water Quality Page