PlainWater
States → California

PORTOLA IMPROVEMENT ASSOCIATION MWC

PWS ID: CA4100555 · LA HONDA, California 94020

Population Served
90
Total Violations
53
Health-Based Violations
1
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Private
Connections
34
County
San Mateo
School/Daycare
No
MCL Violations
1
Monitoring Violations
51
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 2 2010
Surface Water Treatment Rule MR 2 2024
Nitrate-Nitrite MR 2 2005
Benzene MR 2 2005
CHLOROBENZENE MR 2 2005
Tetrachloroethylene MR 2 2005
1,1,1-Trichloroethane MR 2 2005
1,1,2-Trichloroethane MR 2 2005
o-Dichlorobenzene MR 2 2005
1,2-Dichloropropane MR 2 2005
trans-1,2-Dichloroethylene MR 2 2005
Trichloroethylene MR 2 2005
cis-1,2-Dichloroethylene MR 2 2005
Xylenes, Total MR 2 2005
Gross Alpha, Excl. Radon and U MR 2 1981
Toluene MR 2 2005
Vinyl chloride MR 2 2005
1,2-Dichloroethane MR 2 2005
p-Dichlorobenzene MR 2 2005
Styrene MR 2 2005
1,2,4-Trichlorobenzene MR 2 2005
Ethylbenzene MR 2 2005
1,1-Dichloroethylene MR 2 2005
DICHLOROMETHANE MR 2 2005
Carbon tetrachloride MR 2 2005
Lead and Copper Rule MR 1 1993
Mercury MCL 1 1980
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.