SAN LUIS OBISPO, CA

Total Incidents:
128
Last Incident:
October 01, 2018

Note: Just because the latest incident is in 2017 or 2018 doesn't mean your water is free of contaminants! There is a considerable lag between when data is collected and when it is published by the EPA.

Contaminants

All Incidents

Water System Type Measure Violation Effects Begin Date
PLEASANT VALLEY ELEMENTARY Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2018-10-01
COUNTRY HILLS ESTATES Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2018-07-01
RIM ROCK WATER COMPANY Arsenic MCL, Single Sample Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2018-07-01
NACIMIENTO WATER COMPANY Total Haloacetic Acids (HAA5) MCL, Average Maximum Contaminant Level Violation Increased risk of cancer 2018-07-01
PLEASANT VALLEY ELEMENTARY Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2018-07-01
RIM ROCK WATER COMPANY Arsenic MCL, Single Sample Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2018-04-01
PLEASANT VALLEY ELEMENTARY Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2018-04-01
COUNTRY HILLS ESTATES Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2018-04-01
RIM ROCK WATER COMPANY Arsenic MCL, Single Sample Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2018-01-01
COUNTRY HILLS ESTATES Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2018-01-01
PLEASANT VALLEY ELEMENTARY Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2018-01-01
COUNTRY HILLS ESTATES Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2017-10-01
RIM ROCK WATER COMPANY Arsenic MCL, Single Sample Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2017-10-01
PLEASANT VALLEY ELEMENTARY Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2017-10-01
PLEASANT VALLEY ELEMENTARY Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2017-07-01
COUNTRY HILLS ESTATES Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2017-07-01
COUNTRY HILLS ESTATES Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2017-04-01
PLEASANT VALLEY ELEMENTARY Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2017-04-01
SAN MIGUELITO MWC TTHM MCL, Average Maximum Contaminant Level Violation Liver, kidney or central nervous system problems; increased risk of cancer 2017-01-01
SAN MIGUELITO MWC TTHM MCL, Average Maximum Contaminant Level Violation Liver, kidney or central nervous system problems; increased risk of cancer 2017-01-01
NACIMIENTO WATER COMPANY TTHM MCL, Average Maximum Contaminant Level Violation Liver, kidney or central nervous system problems; increased risk of cancer 2017-01-01
COUNTRY HILLS ESTATES Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2017-01-01
PLEASANT VALLEY ELEMENTARY Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2017-01-01
NACIMIENTO WATER COMPANY TTHM MCL, Average Maximum Contaminant Level Violation Liver, kidney or central nervous system problems; increased risk of cancer 2017-01-01
NACIMIENTO WATER COMPANY TTHM MCL, Average Maximum Contaminant Level Violation Liver, kidney or central nervous system problems; increased risk of cancer 2016-10-01
PLEASANT VALLEY ELEMENTARY Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2016-10-01
NACIMIENTO WATER COMPANY TTHM MCL, Average Maximum Contaminant Level Violation Liver, kidney or central nervous system problems; increased risk of cancer 2016-10-01
COUNTRY HILLS ESTATES Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2016-10-01
FIERO LANE WATER COMPANY, INC. Nitrate MCL, Single Sample Maximum Contaminant Level Violation Infants below the age of six months who drink water containing nitrite in excess of the MCL could become seriously ill and, if untreated, may die. Symptoms include shortness of breath and blue-baby syndrome. 2016-07-25
FIERO LANE WATER COMPANY, INC. Nitrate MCL, Single Sample Maximum Contaminant Level Violation Infants below the age of six months who drink water containing nitrate in excess of the MCL could become seriously ill and, if untreated, may die. Symptoms include shortness of breath and blue-baby syndrome. 2016-07-25
NACIMIENTO WATER COMPANY Total Haloacetic Acids (HAA5) MCL, Average Maximum Contaminant Level Violation Increased risk of cancer 2016-07-01
NACIMIENTO WATER COMPANY Total Haloacetic Acids (HAA5) MCL, Average Maximum Contaminant Level Violation Increased risk of cancer 2016-07-01
NACIMIENTO WATER COMPANY TTHM MCL, Average Maximum Contaminant Level Violation Liver, kidney or central nervous system problems; increased risk of cancer 2016-07-01
PLEASANT VALLEY ELEMENTARY Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2016-07-01
COUNTRY HILLS ESTATES Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2016-07-01
NACIMIENTO WATER COMPANY TTHM MCL, Average Maximum Contaminant Level Violation Liver, kidney or central nervous system problems; increased risk of cancer 2016-07-01
NACIMIENTO WATER COMPANY TTHM MCL, Average Maximum Contaminant Level Violation Liver, kidney or central nervous system problems; increased risk of cancer 2016-04-01
COUNTRY HILLS ESTATES Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2016-04-01
FIERO LANE WATER COMPANY, INC. Nitrate MCL, Average Maximum Contaminant Level Violation Infants below the age of six months who drink water containing nitrite in excess of the MCL could become seriously ill and, if untreated, may die. Symptoms include shortness of breath and blue-baby syndrome. 2016-04-01
PLEASANT VALLEY ELEMENTARY Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2016-04-01
NACIMIENTO WATER COMPANY TTHM MCL, Average Maximum Contaminant Level Violation Liver, kidney or central nervous system problems; increased risk of cancer 2016-04-01
FIERO LANE WATER COMPANY, INC. Nitrate MCL, Average Maximum Contaminant Level Violation Infants below the age of six months who drink water containing nitrate in excess of the MCL could become seriously ill and, if untreated, may die. Symptoms include shortness of breath and blue-baby syndrome. 2016-04-01
NACIMIENTO WATER COMPANY TTHM MCL, Average Maximum Contaminant Level Violation Liver, kidney or central nervous system problems; increased risk of cancer 2016-01-01
NACIMIENTO WATER COMPANY TTHM MCL, Average Maximum Contaminant Level Violation Liver, kidney or central nervous system problems; increased risk of cancer 2016-01-01
PLEASANT VALLEY ELEMENTARY Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2016-01-01
COUNTRY HILLS ESTATES Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2016-01-01
NACIMIENTO WATER COMPANY Total Haloacetic Acids (HAA5) MCL, Average Maximum Contaminant Level Violation Increased risk of cancer 2015-10-01
PLEASANT VALLEY ELEMENTARY Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2015-10-01
COUNTRY HILLS ESTATES Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2015-10-01
NACIMIENTO WATER COMPANY Total Haloacetic Acids (HAA5) MCL, Average Maximum Contaminant Level Violation Increased risk of cancer 2015-10-01
COUNTRY HILLS ESTATES Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2015-07-01
PLEASANT VALLEY ELEMENTARY Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2015-07-01
SAN LUIS OBISPO WATER DEPARTMENT TTHM MCL, Average Maximum Contaminant Level Violation Liver, kidney or central nervous system problems; increased risk of cancer 2015-04-01
COUNTRY HILLS ESTATES Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2015-04-01
SAN LUIS OBISPO WATER DEPARTMENT TTHM MCL, Average Maximum Contaminant Level Violation Liver, kidney or central nervous system problems; increased risk of cancer 2015-04-01
PLEASANT VALLEY ELEMENTARY Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2015-04-01
COUNTRY HILLS ESTATES Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2015-01-01
PLEASANT VALLEY ELEMENTARY Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2015-01-01
COUNTRY HILLS ESTATES Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2014-10-01
PLEASANT VALLEY ELEMENTARY Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2014-10-01
COUNTRY HILLS ESTATES Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2014-07-01
PLEASANT VALLEY ELEMENTARY Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2014-07-01
COUNTRY HILLS ESTATES Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2014-04-01
PLEASANT VALLEY ELEMENTARY Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2014-04-01
COUNTRY HILLS ESTATES Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2014-01-01
CALTRANS - SHANDON REST STOP Coliform (TCR) MCL, Monthly (TCR) Maximum Contaminant Level Violation Not a health threat in itself; it is used to indicate whether other potentially harmful bacteria may be present5 2014-01-01
PLEASANT VALLEY ELEMENTARY Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2014-01-01
PLEASANT VALLEY ELEMENTARY Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2013-10-01
COUNTRY HILLS ESTATES Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2013-10-01
PLEASANT VALLEY ELEMENTARY Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2013-07-01
COUNTRY HILLS ESTATES Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2013-07-01
PLEASANT VALLEY ELEMENTARY Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2013-04-01
COUNTRY HILLS ESTATES Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2013-04-01
PLEASANT VALLEY ELEMENTARY Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2013-01-01
GOLDEN STATE WATER COMPANY-CYPRESS RIDGE Nitrate MCL, Single Sample Maximum Contaminant Level Violation Infants below the age of six months who drink water containing nitrite in excess of the MCL could become seriously ill and, if untreated, may die. Symptoms include shortness of breath and blue-baby syndrome. 2013-01-01
GOLDEN STATE WATER COMPANY-CYPRESS RIDGE Nitrate MCL, Single Sample Maximum Contaminant Level Violation Infants below the age of six months who drink water containing nitrate in excess of the MCL could become seriously ill and, if untreated, may die. Symptoms include shortness of breath and blue-baby syndrome. 2013-01-01
COUNTRY HILLS ESTATES Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2013-01-01
GOLDEN STATE WATER COMPANY-CYPRESS RIDGE Nitrate MCL, Single Sample Maximum Contaminant Level Violation Infants below the age of six months who drink water containing nitrate in excess of the MCL could become seriously ill and, if untreated, may die. Symptoms include shortness of breath and blue-baby syndrome. 2013-01-01
GOLDEN STATE WATER COMPANY-CYPRESS RIDGE Nitrate MCL, Single Sample Maximum Contaminant Level Violation Infants below the age of six months who drink water containing nitrite in excess of the MCL could become seriously ill and, if untreated, may die. Symptoms include shortness of breath and blue-baby syndrome. 2013-01-01
PLEASANT VALLEY ELEMENTARY Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2012-10-01
COUNTRY HILLS ESTATES Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2012-10-01
COUNTRY HILLS ESTATES Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2012-07-01
PLEASANT VALLEY ELEMENTARY Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2012-07-01
COUNTRY HILLS ESTATES Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2012-04-01
NACIMIENTO WATER COMPANY Total Haloacetic Acids (HAA5) MCL, Average Maximum Contaminant Level Violation Increased risk of cancer 2012-04-01
NACIMIENTO WATER COMPANY Total Haloacetic Acids (HAA5) MCL, Average Maximum Contaminant Level Violation Increased risk of cancer 2012-04-01
PLEASANT VALLEY ELEMENTARY Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2012-04-01
HERITAGE RANCH CSD Coliform (TCR) MCL, Monthly (TCR) Maximum Contaminant Level Violation Not a health threat in itself; it is used to indicate whether other potentially harmful bacteria may be present5 2012-01-01
COUNTRY HILLS ESTATES Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2012-01-01
PLEASANT VALLEY ELEMENTARY Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2012-01-01
COUNTRY HILLS ESTATES Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2011-10-01
PLEASANT VALLEY ELEMENTARY Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2011-10-01
PLEASANT VALLEY ELEMENTARY Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2011-07-01
GOLDEN STATE WATER COMPANY-CYPRESS RIDGE Nitrate Notification, State Other Violation Infants below the age of six months who drink water containing nitrite in excess of the MCL could become seriously ill and, if untreated, may die. Symptoms include shortness of breath and blue-baby syndrome. 2011-07-01
GOLDEN STATE WATER COMPANY-CYPRESS RIDGE Nitrate Notification, State Other Violation Infants below the age of six months who drink water containing nitrate in excess of the MCL could become seriously ill and, if untreated, may die. Symptoms include shortness of breath and blue-baby syndrome. 2011-07-01
GOLDEN STATE WATER COMPANY-CYPRESS RIDGE Nitrate Notification, State Other Violation Infants below the age of six months who drink water containing nitrite in excess of the MCL could become seriously ill and, if untreated, may die. Symptoms include shortness of breath and blue-baby syndrome. 2011-07-01
GOLDEN STATE WATER COMPANY-CYPRESS RIDGE Nitrate Notification, State Other Violation Infants below the age of six months who drink water containing nitrate in excess of the MCL could become seriously ill and, if untreated, may die. Symptoms include shortness of breath and blue-baby syndrome. 2011-07-01
COUNTRY HILLS ESTATES Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2011-07-01
COUNTRY HILLS ESTATES Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2011-04-01
PLEASANT VALLEY ELEMENTARY Arsenic MCL, Average Maximum Contaminant Level Violation Skin damage or problems with circulatory systems, and may have increased risk of getting cancer 2011-04-01