Tapcensus

Water quality for ZIP code 91784

ZIP 91784 covers Upland, San Antonio Heights, and Rancho Cucamonga in San Bernardino County, California, one of 91 ZIP codes in the county. 321 active public water systems serve the county; 146 had an EPA violation in the past three years.

Most likely your provider

Upland, City of CA3610050 · Community water system · Surface water · Upland
Serves 78,376 people Rules violated, past 3 years 0 Last sanitary survey Oct 28, 2025 Distance 1.6 mi

Your location is within the outer bounds of this system's EPA service area.

View system details EPA facility report

Other community water systems in San Bernardino County

146 systems, nearest first
SystemServesStatusRules violated, 3 yrDistance
San Antonio Water Company
 3,441 0 1.0 mi
West End Consolidated Water Company
 0 0 4.0 mi
Cucamonga Valley Water District
 213,375 0 5.4 mi
San Antonio Canyon Msc
 119 1 6.5 mi
Monte Vista WD
 56,390 0 6.5 mi
Snowcrest Heights Imp Assoc
 403 0 6.6 mi
MT Baldy Homeowners Assn.
 350 0 6.7 mi
Ontario Municipal Utilities Company
Ontario		 185,010 0 7.6 mi
Chino, City of
Chino		 90,187 0 11.0 mi
California Institution for Men
 10,667 1 11.2 mi
San Gabriel Valley WC Fontana
 228,270 0 11.4 mi
Lytle Springs WC
 475 0 11.8 mi
California Institution for Women
 1,035 0 13.3 mi
Chino Hills, City of
Chino Hills		 76,314 0 13.8 mi
Marygold Mwc
 3,155 1 14.3 mi
West Valley Water District
 96,123 0 14.6 mi
Devore WC
 1,574 0 15.5 mi
Golden State Water CO Wrightwood
 4,153 0 15.5 mi
Rialto, City of
Rialto		 59,264 0 16.1 mi
Muscoy Mwc No. 1
 13,000 1 17.9 mi
Terrace Water Company
 2,400 0 18.6 mi
San Bernardino City
San Bernardin0		 214,665 0 20.0 mi
Colton, City of
Colton		 46,525 0 20.1 mi
Sheep Creek Water Company
 4,002 1 20.1 mi
Cedarpines Park Mwc
 2,458 0 20.5 mi
All 147 community water systems in San Bernardino County
Non-community systems in San Bernardino County (174: schools, campgrounds, workplaces, restaurants)

These systems serve places you visit rather than homes.

SystemServesStatusRules violated, 3 yrUnresolved
Lytle Creek Administration Site
 100 5 3
MT Baldy Ski Lift
 1,000 0 0
SS Hert Trucking INC
 25 0 0
Bonita Ranch RV Campground
 400 1 0
Hidden Acres
 25 0 0
Mountain Streams RV Park
 16 1 0
Applewhite Campground
 3,177 1 0
Glen Helen Truck Parking Facility
 25 0 0
Petrolink Hwy 138 INC
 25 0 0
Arrowhead Regional Medical Center
 4,500 0 0
Socal Mobile Food Facility
Colton 		25 0 0
Silverwood Japanese Restaurant Sushi & G
 25 1 0
Thousand Pines Christian
 28 1 1
Church of Spiritual Technology
 51 1 0
Alpine Retreat and Camp
 309 0 0
Best Western Cajon Pass
 34 1 0
Joshua Inn
 25 1 0
Burger King #9310
 510 1 0
Forest Lawn Scout Reservation
 200 2 0
Pali Overnight Adventures
 54 0 0
8986 Deep Creek Road
 300 1 0
EL Mirage School
 50 1 1
EL Mirage Market
 100 0 0
Dovid Oved Retreat Center
 100 0 0
The High Adobe
 25 0 0
Calvary Chapel Christian Camp
 34 0 0
Ponderosa Pines Christian Camp
 202 0 0
Camp Cedar Crest
 310 1 0
Green Valley Campground
 3,029 0 0
Cemex Calif Cement LLC VV
 100 1 1
Holland Burger Cafe
 100 2 0
Snow Valley Mountain Resort
 35 2 0
Lone Wolf Colony
 114 0 0
Victor Valley Wastewater Reclam
 80 2 0
Big Pine Flats Admin & Recreation
 417 0 0
Loch Leven Christian Camp & Conference C
 100 1 0
R W Ranch
 101 0 0
Redlands Colony Pipeline Association
 21 1 1
Parrish Ranch
 25 0 0
Hanna Flats Campground
 4,850 0 0
Camp Angelus TR Land Assn
 57 0 0
YMCA Camp Whittle
 30 1 0
OG Investments, LLC
 30 0 0
Camp Cedar Falls
 405 0 0
Los Rios Rancho Water System
 46 1 0
Forest Home Christian CC
 100 2 0
Seven Oaks MT Resort MHP
 321 0 0
Riley's Log Cabin Farm
 105 1 0
Riley's Farm
 2,400 1 0
The Red Hen
 61 0 0
All non-community systems
About this data

Water systems are matched to San Bernardino County, the county this ZIP code lies in, nearest to the ZIP code's centre first. Your exact provider depends on your address and connection; the largest community water system in a county is usually the city or town utility. Distances are measured to the centre of the service area EPA publishes for the system or, for systems without one, to the centre of the first town EPA lists the system as serving, from Census Bureau place files.

ZIP code areas and town boundaries come from the U.S. Census Bureau's 2020 ZCTA files.

Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The California records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.