Is Upland, CA tap water safe?

Data: U.S. EPA · How we read the data · How we check it

No federal limits exceeded in EPA data for Cucamonga Valley Water District.

4 public water systems serve parts of Upland. The largest, Cucamonga Valley Water District, serves 213,375 people, and one system here had PFAS above a federal limit. Your water bill names your system.

Largest system

Cucamonga Valley Water District

213,375 people · Surface water · EPA ID CA3610018

Buys treated water from San Gabriel Valley Water Company – Fontana, City of Upland, Ontario Municipal Utilities Company.

PFAS	Highest average	Limit	Status
PFOA Not detected	–	4 ppt	Not detected
PFOS Not detected	–	4 ppt	Not detected
PFHxS Not detected	–	10 ppt	Not detected
PFNA Not detected	–	10 ppt	Not detected
HFPO-DA (GenX) Not detected	–	10 ppt	Not detected

ppt = parts per trillion. "Highest average" is the highest average at any of the system's entry points, the way EPA compares results with the limits.

Lead: 0 ppb at the 90th percentile (Dec 2024, and 9 in 10 homes sampled were at or below it) Below action level
Health-based violations since 2016: 0

Full Cucamonga Valley Water District results

Across California, 129 of 691 water systems EPA tested had PFAS above a 2024 federal limit, and 26 systems were above the lead action level in results from the last five years. California results.

Upland homes and lead pipes

56%

of homes built before 1980 (California 56%, US 50%)

built before 1950 (California 14%)

43%

of households rent (California 44%)

Lead service lines and lead solder were allowed until 1986, so homes from before then are the ones to check. Renting? Ask your landlord what the service line is made of, because it's their pipe to replace. How to check your own line.

Housing: Census American Community Survey 2020–2024 5-year estimates for Upland city (tables B25034, B25003). Estimates for small places have a margin of error.

Which system serves your ZIP code

Based on the ZIP codes each system reported serving. Boundaries don't follow ZIP lines exactly, so your water bill is the final word.

System	ZIP codes in Upland
Cucamonga Valley Water District 213,375 people	91784
City of Upland 78,376 people	91786

Other water systems serving Upland

City of Upland
78,376 people · Surface water · California · lists this city
No PFAS above limits
Golden State Water Company – Claremont
39,776 people · Purchased surface water · California · reported ZIPs here
PFOA above limitAlso: PFOS above limit · PFHxS detected
San Antonio Water Company
3,441 people · Groundwater · California · reported ZIPs here
No PFAS above limits

How nearby cities compare

City	Main water system	PFAS	Lead (90th pct.)
Montclair 4 mi Monte Vista Water District	Monte Vista Water District	Above limit	0 ppb
Rancho Cucamonga 5 mi Cucamonga Valley Water District	Cucamonga Valley Water District	None above limits	0 ppb
Ontario 6 mi Cucamonga Valley Water District	Cucamonga Valley Water District	None above limits	0 ppb
La Verne 6 mi Walnut Valley Water District	Walnut Valley Water District	None above limits	0 ppb
Pomona 7 mi City of Pomona Water Dept.	City of Pomona Water Dept.	Above limit	2.1 ppb
San Dimas 9 mi Golden State Water Company – San Dimas	Golden State Water Company – San Dimas	Above limit	2.1 ppb

Questions

Is Upland tap water safe to drink?

Cucamonga Valley Water District has had no health-based violations since 2016. Utility data can't show lead from your own pipes: if your home was built before 1986, test your tap. Your utility's annual Consumer Confidence Report is the official summary.

Who supplies water in Upland, CA?

4 public water systems serve parts of Upland. The largest is Cucamonga Valley Water District (213,375 people). Your water bill names your system. The EPA ID is also on your utility's Consumer Confidence Report.

Does Upland tap water have PFAS?

None detected above EPA's reporting limits. Cucamonga Valley Water District had no PFAS detected in EPA's 2023–2025 testing. "Not detected" means below the reporting limit (about 2 to 20 ppt), not proven zero.

Do Upland homes have lead pipes?

Census estimates put 56% of Upland homes as built before 1980 (California: 56%). Lead service lines and lead solder were allowed until 1986, so older homes are more likely to have them. Cucamonga Valley Water District's service line inventory says what your line is made of. The only way to know for your home is to check the line where it enters the house and test your tap.

Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.