Apr 15, 2026 · 7 min read
PFAS "Forever Chemicals" in US Drinking Water: 2026 Update
PFAS contamination affects an estimated 200 million Americans. Here's what the latest EPA enforcement means for your tap water.
ZIP Code 77378 Water Quality
Texas · 20,329 people served · 19 water systems
D
PoorZIP code 77378 is in Texas and is a small city from a drinking-water-service perspective, with 20,329 people served by 19 EPA-registered public water systems. It overlaps with 2 communities including WILLIS, NEW WAVERLY.
Within ZIP code 77378, the EPA Safe Drinking Water Information System (SDWIS) records 7 health-based violations during the past five years across 19 water systems serving this postal area. The grade of D reflects the aggregate compliance pattern, not the current daily water quality.
Last updated: 2026-05-18 · Source: EPA SDWIS
ZIP Code Location
Loading map...
Cities in ZIP 77378
Water Systems Serving 77378
WALNUT COVE WSC
PWSID: TX1700389
2,076 served
CLEAR WATER COVE INC
PWSID: TX1700480
645 served
FIVE OAKS ESTATES
PWSID: TX1460159
225 served
ROGERS ROAD WATER SYSTEM
PWSID: TX1700590
567 served
TIMBER LINE ESTATES
PWSID: TX1700728
579 served
SHANNON PLACE WATER SYSTEM
PWSID: TX0930052
159 served
RIVER OAKS SUNSHINE ACRES
PWSID: TX1450017
99 served
TRAILS END SUBDIVISION
PWSID: TX2040066
1,444 served
BEE CREEK ESTATES
PWSID: TX1700685
228 served
EMERSON ESTATES
PWSID: TX1700683
1,974 served
CREEKSIDE ACRES WATER SYSTEM
PWSID: TX1700680
291 served
MOUNT PLEASANT VILLAGE WATER SYSTEM
PWSID: TX1700423
255 served
BRIDGEPOINT SUBDIVISION
PWSID: TX1700316
291 served
WAVERLY ACRES WATER SYSTEM
PWSID: TX2360093
369 served
HWY 59 ESTATES
PWSID: TX1460160
372 served
CEDAR CREEK RANCH SUBDIVISION
PWSID: TX2370084
96 served
HARRIS COUNTY MUD 544 INDIAN SPRINGS
PWSID: TX1013853
0 served
CITY OF WILLIS
PWSID: TX1700003
9,867 served
SAN JO UTILITIES
PWSID: TX1700327
792 served
About ZIP-code water data
Postal-code level water quality data is built up from the underlying water systems — multiple ZIPs may share a single utility, and a single ZIP can span multiple utilities. For property-level information, contact the specific utility serving your address. EPA data on this page was last refreshed on 2026-05-18.
From the Blog
Photo by Bluewater Sweden on Unsplash
Mar 22, 2026 · 6 min read
How to Read Your Annual Water Quality Report (CCR)
Your water utility is legally required to send you a Consumer Confidence Report every year. Here's how to actually understand it.
Photo by Louis Hansel on Unsplash
Mar 5, 2026 · 9 min read
Lead in Tap Water: The Complete 2026 Guide
Lead enters drinking water through old pipes and fixtures. Here's how to identify your risk and what to do about it.
Photo by Eduardo Casajús Gorostiaga on Unsplash
Feb 18, 2026 · 5 min read
What Is an EPA Maximum Contaminant Level (MCL)?
MCLs are the foundation of US drinking water safety. Here's how they're set and what they mean for your tap.
Photo by Naja Bertolt Jensen on Unsplash
