Norwalk - City, Water Dept.

Published drinking-water records and contacts for Norwalk - City, Water Dept.. System CA1910191. Review sources and dates; not a real-time water assessment.

System ID: CA1910191
State or territory: CA
Published population served: 20283
System type (source code): CWS

Published records and dates

PFAS / lithium (EPA UCMR 5): 600 — 2024-02-27 – 2024-11-20
Lead and copper monitoring summaries: 43 — 1992-01-01 – 2028-12-31
California DDW laboratory results: 374 — 2026-01-12 – 2026-06-15

Missing records here do not mean the provider did not test. Published records are not a real-time assessment of your tap water.

Published testing results

Selected recent records are shown below. Different sampling locations and dates are not interchangeable. These excerpts are not a complete testing history.

“<” means below the stated reporting limit, not zero. A reported measurement alone is not a safety verdict. Read an example

EPA UCMR 5 — most recent imported sample per substance
Substance	Published result	Reporting limit	Sample date	Sampling location
11Cl-PF3OUdS	< 0.005 µg/L	0.005 µg/L	2024-11-20	City of Santa Fe Springs / 1910191805
4:2 FTS	< 0.003 µg/L	0.003 µg/L	2024-11-20	MWD Intertie / 1910191803
6:2 FTS	< 0.005 µg/L	0.005 µg/L	2024-11-20	Cabrillo / 14332
8:2 FTS	< 0.005 µg/L	0.005 µg/L	2024-11-20	Cabrillo / 14332
9Cl-PF3ONS	< 0.002 µg/L	0.002 µg/L	2024-11-20	Cabrillo / 14332
ADONA	< 0.003 µg/L	0.003 µg/L	2024-11-20	Cabrillo / 14332
HFPO-DA	< 0.005 µg/L	0.005 µg/L	2024-11-20	City of Santa Fe Springs / 1910191805
NEtFOSAA	< 0.005 µg/L	0.005 µg/L	2024-11-20	MWD Intertie / 1910191803
NFDHA	< 0.02 µg/L	0.02 µg/L	2024-11-20	Cabrillo / 14332
NMeFOSAA	< 0.006 µg/L	0.006 µg/L	2024-11-20	City of Santa Fe Springs / 1910191805
PFBA	< 0.005 µg/L	0.005 µg/L	2024-11-20	City of Cerritos / 1910191804
PFBS	< 0.003 µg/L	0.003 µg/L	2024-11-20	MWD Intertie / 1910191803
PFDA	< 0.003 µg/L	0.003 µg/L	2024-11-20	Cabrillo / 14332
PFDoA	< 0.003 µg/L	0.003 µg/L	2024-11-20	MWD Intertie / 1910191803
PFEESA	< 0.003 µg/L	0.003 µg/L	2024-11-20	MWD Intertie / 1910191803
PFHpA	< 0.003 µg/L	0.003 µg/L	2024-11-20	City of Cerritos / 1910191804
PFHpS	< 0.003 µg/L	0.003 µg/L	2024-11-20	Cabrillo / 14332
PFHxA	< 0.003 µg/L	0.003 µg/L	2024-11-20	Cabrillo / 14332
PFHxS	< 0.003 µg/L	0.003 µg/L	2024-11-20	Cabrillo / 14332
PFMBA	< 0.003 µg/L	0.003 µg/L	2024-11-20	Cabrillo / 14332
PFMPA	< 0.004 µg/L	0.004 µg/L	2024-11-20	City of Cerritos / 1910191804
PFNA	< 0.004 µg/L	0.004 µg/L	2024-11-20	City of Santa Fe Springs / 1910191805
PFOA	< 0.004 µg/L	0.004 µg/L	2024-11-20	City of Cerritos / 1910191804
PFOS	< 0.004 µg/L	0.004 µg/L	2024-11-20	MWD Intertie / 1910191803
PFPeA	< 0.003 µg/L	0.003 µg/L	2024-11-20	City of Cerritos / 1910191804
PFPeS	< 0.004 µg/L	0.004 µg/L	2024-11-20	MWD Intertie / 1910191803
PFTA	< 0.008 µg/L	0.008 µg/L	2024-11-20	City of Santa Fe Springs / 1910191805
PFTrDA	< 0.007 µg/L	0.007 µg/L	2024-11-20	City of Santa Fe Springs / 1910191805
PFUnA	< 0.002 µg/L	0.002 µg/L	2024-11-20	City of Santa Fe Springs / 1910191805
lithium	26 µg/L	9 µg/L	2024-11-20	Cabrillo / 14332

Download all EPA UCMR 5 records (CSV)

Lead and copper: 90th-percentile summaries

These describe a monitoring period across sampled locations, not the result at your home. How to read the 90th percentile

Eight most recent imported monitoring summaries
Substance	Published 90th percentile	Monitoring period	Source quarter
Lead (PB90)	0 mg/L	2026-01-01 – 2028-12-31	2026Q3
Lead (PB90)	0 mg/L	2020-01-01 – 2022-12-31	2026Q3
Lead (PB90)	0 mg/L	2017-01-01 – 2019-12-31	2026Q3
Lead (PB90)	0 mg/L	2014-01-01 – 2016-12-31	2026Q3
Lead (PB90)	0 mg/L	2013-01-01 – 2013-12-31	2026Q3
Lead (PB90)	0 mg/L	2010-01-01 – 2012-12-31	2026Q3
Lead (PB90)	0 mg/L	2007-01-01 – 2009-12-31	2026Q3
Lead (PB90)	0.006 mg/L	2004-01-01 – 2006-12-31	2026Q3

Twelve most recent imported state laboratory records
Substance	Published result	Sample date	Location / source
1,4-DIOXANE	2.6 UG/L	2026-06-15	LEFFINGWELL WELL 04 / California DDW laboratory results
MONOBROMOACETIC ACID	< 1.000000000 UG/L	2026-05-19	DBPR Sample / California DDW laboratory results
MONOCHLOROACETIC ACID	< 2.000000000 UG/L	2026-05-19	DBPR Sample / California DDW laboratory results
MONOBROMOACETIC ACID	< 1.000000000 UG/L	2026-05-19	DBPR Sample / California DDW laboratory results
TOTAL HALOACETIC ACIDS (HAA5)	4.4 UG/L	2026-05-19	DBPR Sample / California DDW laboratory results
MONOCHLOROACETIC ACID	< 2.000000000 UG/L	2026-05-19	DBPR Sample / California DDW laboratory results
CHLOROFORM	5.7 UG/L	2026-05-19	DBPR Sample / California DDW laboratory results
BROMOFORM	4.0 UG/L	2026-05-19	DBPR Sample / California DDW laboratory results
MONOCHLOROACETIC ACID	< 2.000000000 UG/L	2026-05-19	DBPR Sample / California DDW laboratory results
TOTAL HALOACETIC ACIDS (HAA5)	1.3 UG/L	2026-05-19	DBPR Sample / California DDW laboratory results
BROMOFORM	4.1 UG/L	2026-05-19	DBPR Sample / California DDW laboratory results
BROMODICHLOROMETHANE	10.5 UG/L	2026-05-19	DBPR Sample / California DDW laboratory results

State sampling points can include untreated water. Publisher qualifiers and units are retained; consult the full source notes before interpreting a record.

Download state records with source notes (CSV)

Published compliance history

1 imported records. Status is as recorded in the source; historical records are not current advisories. Missing records do not establish that no violations occurred.

Twenty most recent imported compliance records
Rule / record	Period	Recorded status	Health-based (EPA classification)	Source quarter
Lead and Copper Rule / Follow-up Or Routine LCR Tap M/R	2025-10-01 – —	Unaddressed	No	2026Q3

Source dates and refresh checks

A refresh check is not a sample date. Publication periods, sample dates and checks are shown separately.

EPA SDWIS lead/copper summaries and service areas — source period: — – —; last checked: 2026-10-17
EPA SDWIS contacts and compliance records — source period: — – —; last checked: 2026-10-17
EPA UCMR 5 sample results — source period: 2023-01-03 – 2026-06-17; last checked: 2026-10-17
California DDW laboratory results — last successful check: 2026-10-17

Administrative contact (EPA filing)

Koontz, Jacque: 562-929-5926

An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.

Official state resources · How to read these records