Nipomo Comm. Services District

The following page lists all water contaminants identified during our most recent testing cycle. Remember that the presence of contaminants doesn't necessarily indicate a health risk. State and Federal regulations require monitoring for certain substances less frequently than annually because their concentrations typically remain stable year to year.

TERMS AND DEFINITIONS

• Maximum Contaminant Level (MCL): The highest permitted contaminant level in municipal water. Primary MCLs are set as close to health goals as economically and technically feasible.
• Secondary MCLs: Established to protect water's odor, taste, and appearance.
• Maximum Contaminant Level Goal (MCLG): The contaminant level below which no known or expected health risks exist.
• Public Health Goal (PHG): California EPA's established level below which no known health risks exist.
• Maximum Residual Disinfectant Level (MRDL): Highest allowed disinfectant level in water.

Water hardness results from dissolved minerals—primarily calcium and magnesium. While not harmful to health, these minerals can cause spotting on glassware and fixtures. Recent testing showed hardness ranges varying throughout our service area.

Nitrate levels above 10 mg/L pose health risks particularly to infants under six months, potentially affecting oxygen transport in blood. Pregnant women and those with enzyme deficiencies should consult healthcare providers if concerned about nitrate levels.

Lead exposure primarily comes from service lines and home plumbing materials. To minimize exposure, flush your tap for 30 seconds to 2 minutes before using water for drinking or cooking. Consider collecting this water for plant watering. Information about lead testing is available from the Safe Drinking Water Hotline.

Common Questions About Water Quality

What causes water hardness?
Water hardness results from naturally occurring dissolved minerals, primarily calcium and magnesium. While not harmful to health, these minerals can leave white spots on glassware and plumbing fixtures. Local groundwater varies in hardness levels from moderately hard to very hard, while surface water sources are typically softer.

How is our municipal water treated?
Treatment methods vary by source:

• Groundwater typically receives chlorine disinfection to prevent bacterial growth
• Surface water undergoes more extensive treatment including microfiltration, activated carbon filtration, and pH adjustment before final disinfection

Is fluoride added to our water?
Municipal water systems have different approaches to fluoride. Some add it to prevent dental cavities, while others rely on naturally occurring levels. Check your annual water quality report for specific information about fluoride levels in your area.

Why are there contaminants in municipal water?
All water, including bottled water, naturally contains some level of substances. Municipal water may contain:

1. Microbial contaminants from wildlife, sewage systems, or agricultural operations
2. Inorganic substances like salts and metals from natural sources or urban runoff
3. Pesticides and herbicides from agriculture and residential use
4. Organic chemicals from industrial processes, petroleum production, or septic systems
5. Radioactive components that occur naturally or result from industrial activities

Who might be more vulnerable to water contaminants?
Some individuals may be particularly sensitive to certain contaminants, including people undergoing chemotherapy, organ transplant recipients, those with HIV/AIDS or immune disorders, elderly individuals, and infants. These populations should seek specific advice from healthcare providers regarding water consumption.