The Power of Information

National Drinking Water Database


Naphthalene in California


Naphthalene is an intermediate in chemical manufacturing, a moth repellent, a fungicide, and a pollutant from the incomplete combustion of fossil fuels. [read more]

The Most Polluted Communities in California

8 water utilities reported detecting Naphthalene in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Naphthalene level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Buena Vista Wc
Salinas, CA
5501 of 50.55 ppb
(0 to 2.75 ppb)
2Spindrift Marina
Isleton, CA
1001 of 10.5 ppb
(0.5 ppb)
3Corral Hollow Pws
Tracy, CA
981 of 10.4 ppb
(0.4 ppb)
4Stanford University
Stanford, CA
24,0001 of 190.05 ppb
(0 to 0.9 ppb)
5City of Ripon
Ripon, CA
8,2001 of 510.01 ppb
(0 to 0.59 ppb)
6Valley Water Co.
La Canada Flintrige, CA
9,4771 of 126< 0.01 ppb
(0 to 1 ppb)
7City of Sunnyvale
Sunnyvale, CA
125,8001 of 29< 0.01 ppb
(0 to 0.17 ppb)
8Glendale-City, Water Dept.
Glendale, CA
200,0002 of 319< 0.01 ppb
(0 to 0.01 ppb)

Health Based Limits for Naphthalene

StandardDescriptionLevel
Lifetime health-based limit, non-cancer riskConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for a lifetime of exposure. The Lifetime health-based limit (or Health Advisory, HA) is based on exposure for a a 70-kg adult consuming 2 liters of water per day. Source: U.S. Environmental Protection Agency.100 ppb
Health-Based Screening LevelA benchmark concentration of contaminants in water that may be of potential concern for human health, if exceeded. For noncarcinogens, the HBSL represents the contaminant concentration in drinking water that is not expected to cause any adverse effects over a lifetime of exposure. For carcinogens, the HBSL range represents the contaminant concentration in drinking water that corresponds to an excess estimated lifetime cancer risk of 1 chance in 1 million to 1 chance in 10 thousand. Source: U.S. Geological Survey.100 ppb
Children's health-based limit for 1-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for up to one day of exposure. The One-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.500 ppb
Children's health-based limit for 10-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic effects for up to ten days of exposure. The Ten-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.500 ppb
Drinking Water Equivalent LevelA lifetime exposure concentration protective of adverse, noncarcinogenic health effects, that assumes all of the exposure to a contaminant is from drinking water. Source: U.S. Environmental Protection Agency.700 ppb

Violation Summary for Naphthalene in California

There are no violations reported for this contaminant in California