01The verdict: is La Joya water safe?
La Joya's drinking water has significant quality concerns based on EPA testing data. With a grade of F (41/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 3,033 residents using surface water (rivers, lakes, or reservoirs).
69 unresolved violations on record
EPA records show open compliance items for this system. Most are administrative, but unresolved items are worth watching.
See what was cited ↓Lead is well under the limit
90th-percentile lead is 0.0 ppb — beneath the 15 ppb federal action level and under the 5 ppb watch threshold.
See the trend ↓47 violations in the last five years
Recent compliance history is the best predictor of future problems — the year-by-year record is below.
See the record ↓La Joya's drinking water received a grade of F (41 out of 100), indicating failing water quality. The city's 1 water system serves approximately 3,033 residents using surface water.
Lead levels were measured at 0.0 ppb (90th percentile), well within EPA limits. This system has not yet been tested for PFAS under the EPA UCMR 5 program. The system has 114 violations on record, including 28 health-based violations. 69 remain unresolved.
La Joya ranks #991 out of 1067 cities in Texas for water quality, placing it among the lowest-rated in the state. The city draws from surface water sources, which are more susceptible to seasonal runoff and agricultural contamination, requiring extensive multi-barrier treatment including coagulation, filtration, and disinfection. As a small community water system, La Joya may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities. The system has seen 47 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
02What's in La Joya's water
Every contaminant flagged in La Joya, on one shared scale: distance to its own legal limit. The red line is the limit — anything past it is out of compliance, and the closer a bar gets, the less headroom the system has.
Full contaminants report
| Contaminant | Detected Level | EPA Limit | Unit | Category | Status |
|---|---|---|---|---|---|
| Lead (90th percentile) LeadHeavy Metal A toxic heavy metal that can leach into drinking water from older pipes, solder, and fixtures. No amount of lead in water is considered safe. Health EffectsBrain and nervous system damage in children, kidney damage, high blood pressure, and reproductive problems in adults. EPA Limit15 ppb action level Common SourcesCorrosion of lead pipes, lead solder, brass faucets, and household plumbing. | 0.0 | 15 | ppb | Inorganic | Safe |
Cities ranked by 90th-percentile lead PF PFAS in Texas
Cities ranked by compounds detected Cu Copper in Texas
Cities ranked by 90th-percentile copper
03La Joya's ten-year track record
Each box is one year. A green check means no EPA violations; a numbered badge counts that year's violations — red if any were health-based, amber if they were monitoring or paperwork issues. The system has 114 violations on record, including 28 health-based violations. 69 remain unresolved.
1 of the last ten years was clean. The numbered years had EPA violations — red when any were health-based, amber when they were paperwork or missed-testing issues.
▼ Down 5.3 ppb since 1993. Latest reading: 0 ppb (2023) — 0% of the action level. Sampled at higher-risk homes (90th percentile).
04Where La Joya's water comes from
La Joya's drinking water comes primarily from surface water sources such as rivers, lakes, or reservoirs.
Surface Water
Rivers, lakes, or reservoirs — more exposed to runoff, agriculture, and seasonal swings than groundwater.
Local treatment
Multi-barrier treatment: coagulation, sedimentation, filtration, and disinfection to meet EPA standards.
1 system
1 water system, operated under local government ownership.
3,033 people
Residents served across La Joya's service area.
Surface water systems require multi-stage treatment including coagulation, sedimentation, filtration, and disinfection to meet EPA Safe Drinking Water Act standards. These sources can be impacted by seasonal changes, stormwater runoff, upstream agriculture, and industrial discharge. The system is operated by local government ownership and serves approximately 3,033 people through 1 water system.
| System name | PWSID | Population | Source |
|---|---|---|---|
| CITY OF LA JOYA | TX1080213 | 3,033 | Surface Water |
Water bodies near La Joya
As a surface-water system, these water bodies may directly influence La Joya's drinking water supply.
05Pressure on La Joya's watershed
Outside forces that shape what reaches the treatment plant. None of these is a verdict on the tap by itself — but each adds pressure worth knowing about.
Industrial discharge
1 facility within 10 miles reported 0 lb released to surface water in the latest EPA Toxics Release Inventory. Proximity doesn't equal tap contamination — treatment and hydrology decide — but it's pressure on the watershed.
Flood & storm history
10 federal disaster declarations on record for Hidalgo County. Flooding and severe storms can overwhelm treatment plants, cause sewage overflows, and push runoff into supplies.
06How La Joya compares
Scores for nearby Texas cities on one line, with the average marked.
dashed line = Texas average (46/100)
La Joya scores 41/100 — on par with the Texas average of 46/100. It outscores 6 of 10 nearby cities. Full Texas rankings →
27.8 / 100FSan Antonio, TX
33.1 / 100FAustin, TX
31.2 / 100FDallas, TX
36.2 / 100FFort Worth, TX
34.5 / 100FEl Paso, TX
35.8 / 100
Compare all cities in the county — grades, violations, and contaminant data side by side.→
07What to do at home
Steps matched to what testing actually found in La Joya's water — not generic advice.
A basic carbon filter still helps
La Joya's water meets federal standards, but a simple carbon filter improves taste and adds a margin of safety against short-term issues.
Compare tested filters →Read your utility's annual report
Every utility must publish a yearly Consumer Confidence Report with its own testing results. It pairs well with the independent data on this page.
How to read a CCR →Watch for La Joya alerts
This area has a history of flood declarations — after severe weather, watch for boil-water advisories from the utility, and check the live alerts on this page.
All water alerts →Frequently asked questions
Is La Joya, TX tap water safe to drink?
La Joya's water quality earned a grade of F (41/100). Significant issues have been found. A water filter is strongly recommended. The city ranks #991 out of 1067 cities tested in Texas.
What contaminants are in La Joya's water?
Lead was measured at 0.0 ppb (90th percentile). 114 violations are on record.
How is La Joya's water quality grade calculated?
The grade is based on four factors: violation history (40%), lead and copper levels (25%), PFAS contamination (25%), and regulatory compliance (10%). The score is also adjusted based on how complete the available data is. See our methodology page for full details.
Do I need a water filter in La Joya?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does La Joya's water come from?
La Joya's water is sourced from Surface water. The city has 1 water system serving approximately 3,033 residents.
What health violations has La Joya's water system had?
La Joya has 28 health-based violations on record. The most recent violation was recorded in November 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 69 violations remain unresolved.
How does La Joya's water compare to other cities?
La Joya ranks #991 out of 1067 cities in Texas (better than 7% of state cities) and #14739 out of 15382 cities nationally (4th percentile). The grade of F reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does La Joya's small water system affect quality?
La Joya's system serves approximately 3,033 residents. Small community water systems (under 3,300 people) may have fewer financial resources for infrastructure upgrades and advanced treatment technologies. However, they are held to the same EPA drinking water standards as larger systems. This system has 114 violations on record.