CBS reported last week that "very high levels of arsenic" showed up in nearly a quarter of 1,300 California wines tested by independent Denver-based lab BeverageGrades.

"Very high," BeverageGrades founder and former wine distributor Kevin Hicks told CBS, meant four to five times more arsenic than the EPA standard for drinking water, which is 10 parts per billion (ppb), or 10 micrograms per liter (mcg/L).

Arsenic is an odorless, colorless and highly toxic poison known to cause illness and death when ingested. Long term exposure can cause various types of cancer, cardiovascular disease and diabetes, according to medical experts.

The best-selling wines with three, four and five times the 10 ppb arsenic standard were Trader Joe's Two-Buck Chuck White Zinfandel, Ménage à Trois Moscato and Franzia White Grenache. Hicks told CBS the least expensive wines had the higher amounts of arsenic, on a per-liter basis.

Hicks found the results so worrisome that he's filing a class action suit against more than two dozen wine makers and sellers for their unsafe products.

Meanwhile, wine makers are tasked with conducting their own independent testing to (at least they hope) disapprove Hicks' findings.

The question remains for the wine lover: should you be concerned if you are a regular wine drinker?

Kenneth Spaeth, MD, chief of occupational and environmental medicine at the North Shore-LIJ Health System in Great Neck, New York, told Forbes the answer is we simply don't know yet.

"It's a bit of dilemma for consumers right now because there's so much information we don't have," he said. "I also know nothing about the methodology, about how these data were collected and how much consistency there was from sample to sample and bottle to bottle. Given all these gaps in the information, it's hard to give advice about it, but some of the levels sound high enough to caution about how much wine is being consumed."

Based on Hicks' findings, Forbes did the math for two standard glasses of wine a day:

"A 5 oz. glass is approximately 150 ml, so two glasses is 300 ml. If that wine contains arsenic at five times the EPA standard for drinking water, then 300 x 5 means you're getting as much arsenic as the equivalent of drinking 1.5 L of drinking water at the maximum amount allowed by the EPA."

The calculation, however, ignores the total effect of arsenic from different sources. It also assumes that the EPA standard is appropriate, which some experts disagree.

The biggest health concerns related to high arsenic levels in wine? Different types of cancer, especially lung, skin and bladder cancer, according to Forbes.

If you are a concerned wine connoisseur, here is the complete list of wines involved in the lawsuit:

Acronym's GR8RW Red Blend 2011

Almaden's Heritage White Zinfandel

Almaden's Heritage Moscato

Almaden's Heritage White Zinfandel

Almaden's Heritage Chardonnay

Almaden's Mountain Burgundy

Almaden's Mountain Rhine

Almaden's Mountain Chablis

Arrow Creek's Coastal Series Cabernet Sauvignon 2011

Bandit's Pinot Grigio

Bandit's Chardonnay

Bandit's Cabernet Sauvignon

Bay Bridge's Chardonnay

Beringer's White Merlot 2011

Beringer's White Zinfandel 2011

Beringer's Red Moscato

Beringer's Refreshingly Sweet Moscato

Charles Shaw White Zinfandel 2012

Colores del Sol's Malbec 2010

Glen Ellen by Concannon's Glen Ellen REserve Pinot Grigio 2012

Concannon's Selected Vineyards Pinot Noir 2011

Glen Ellen by Concannon's Glen Ellen Reserve Merlot 2010

Cook's Spumante

Corbett Canyon's Pinot Grigio

Corbett Canyon's Cabernet Sauvignon

Cupcake's Malbec 2011

Fetzer's Moscato 2010

Fetzer's Pinot Grigio 2011

Fisheye Pinot Grigio 2012

Flipflop's Pinot Grigio 2012

Flipflop's Moscato

Flipflop's Cabernet Sauvignon

Foxhorn's White Zinfandel

Franzia's Vintner Select White Grenache

Franzia's Vintner Select White Zinfandel

Franzia's Vintner Select White Merlot

Franzia's Vintner Select Burgundy

Hawkstone's Cabernet Sauvignon 2011

HRM Rex Goliath's Moscato

Korbel's Sweet Rose Sparkling Wine

Korbel's Extra Dry Sparkling Wine

Menage a Trois' Pinot Grigio 2011

Menage a Trois' Moscato 2010

Menage a Trois' White Blend 2011

Menage a Trois' Chardonnay 2011

Menage a Trois' Rose 2011

Menage a Trois' Cabernet Sauvignon 2010

Menage a Trois' California Red Wine 2011

Mogen David's Concord

Mogen David's Blackberry Wine

Oak Leaf's White Zinfandel

Pomelo's Sauvignon Blanc 2011

R Collection by Raymond's Chardonnay 2012

Richards Wild Irish Rose's Red Wine

Seaglass's Sauvignon Blanc 2012

Simply Naked's Moscato 2011

Smoking Loon's Viognier 2011

Sutter Home's Sauvignon Blanc 2010

Sutter Home's Gewurztraminer 2011

Sutter Home's Pink Moscato

Sutter Home's Pinot Grigio 2011

Sutter Home's Moscato

Sutter Home's Chenin Blanc 2011

Sutter Home's Sweet Red 2010

Sutter Home's Riesling 2011

Sutter Home's White Merlot 2011

Sutter Home's Merlot 2011

Sutter Home's White Zinfandel 2011

Sutter Home's White Zinfandel 2012

Sutter Home's Zinfandel 2010

Trapiche's Malbec 2012

Tribuno's Sweet Vermouth

Vendange's Merlot

Vendange's White Zinfandel

Wine Cube's Moscato

Wine Cube's Pink Moscato 2011

Wine Cube's Pinot Grigio 2011

Wine Cube's Pinot Grigio

Wine Cube's Chardonnay 2011

Wine Cube's Chardonnay

Wine Cube's Red Sangria

Wine Cube's Sauvignon Blanc 2011

Wine Cube's Cabernet Sauvignon/Shiraz 2011

The wines listed without specific years are non-vintage, which means the grapes used did not come from a single year.