Is Mount Calm, TX Tap Water Safe to Drink?
Graded D, with 28 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
47/100
waterverge.com Mount Calm, TX — Water Quality Report
Mount Calm's drinking water received a grade of D (47 out of 100), indicating poor water quality. The city's 2 water systems serve approximately 2,492 residents using groundwater.
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 121 violations on record, including 51 health-based violations. 28 remain unresolved.
What to know about Mount Calm's water
Mount Calm ranks #827 out of 1067 cities in Texas for water quality, placing it among the lowest-rated in the state.
Mount Calm relies on groundwater, which is generally less vulnerable to surface contamination but can be affected by naturally occurring minerals like arsenic and nitrate, as well as agricultural and industrial runoff.
As a small community water system, Mount Calm may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
The system has seen 27 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Mount Calm, TX water safe to drink?
Mount Calm's drinking water has significant quality concerns based on EPA testing data. With a grade of D (47/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 2 water systems serve approximately 2,492 residents using groundwater (wells).
Recent water quality updates for Mount Calm
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Mount Calm's water quality assessment. Grade: D (47/100).
Contaminants: Lead and Copper Rule.
Contaminants: Lead and Copper Rule, Revised Total Coliform Rule.
Contaminants: Public Notice.
Federal disaster declaration (FEMA DR-4781). Flood event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-4416). Flood event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Mount Calm's water supply.
Well within EPA limits.
Violation history
Mount Calm's water system has 121 total violations on record, including 51 health-based violations. 28 remain unresolved. 27 violations were issued in the last 5 years.
Flood & environmental risk
Hill County has experienced 5 federally declared disasters since 2005. Flooding and severe storms can overwhelm water treatment plants, cause sewage overflows, and introduce agricultural runoff, bacteria, and sediment into drinking water supplies.
Where does Mount Calm's water come from?
Mount Calm's drinking water comes from groundwater (wells), supplied by 2 water systems serving approximately 2,492 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate.
What Mount Calm residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Mount Calm's water.
Your water utility is required to publish an annual Consumer Confidence Report (CCR) with detailed testing results. Ask for the latest copy or check your utility's website.
Mount Calm's area has a history of flooding. After severe weather, watch for boil water advisories from your local utility.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Violation summary
Violations & advisories
Drought conditions
D1 — moderate droughtHill County is currently in D1 (moderate drought) per the U.S. Drought Monitor (week of May 5, 2026). Drought can elevate disinfection-byproduct (TTHM/HAA5) levels and taste/odor issues as utilities draw from lower reservoirs.
Source: U.S. Drought Monitor, updated weekly by NDMC, USDA, and NOAA.
Flood & disaster history
Hill County has experienced 5 federally declared disasters since 2005. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
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 |
Lead level trend (90th percentile)
See how Mount Calm compares by contaminant
Explore where Mount Calm ranks among all Texas cities for specific contaminants.
Water source & infrastructure
Where Mount Calm's water comes from
Mount Calm's drinking water is drawn from underground aquifers through wells.
Groundwater is naturally filtered through rock and soil layers, generally requiring less treatment than surface water. However, it can contain naturally occurring contaminants like arsenic, radon, and minerals.
Agricultural activity, septic systems, and industrial operations near well fields can introduce nitrates, pesticides, and volatile organic compounds.
The system is operated by local government ownership and serves approximately 2,492 people through 2 water systems.
Water systems serving Mount Calm
| System Name | PWSID | Population | Source |
|---|---|---|---|
| BIROME WSC | TX1090017 | 2,018 | GW |
| CITY OF MOUNT CALM | TX1090005 | 474 | GW |
How Mount Calm compares
Full Texas rankings →Mount Calm's score of 47/100 is on par with the average of 46/100 among major Texas cities. It outscores 7 of 10 nearby cities.
Nearby cities
View Texas rankings →About Mount Calm, TX
Wikipedia →Mount Calm is a city in Hill County, Texas, United States. Its population was 282 at the 2020 census.
Learn more about your water
Guides and resources related to Mount Calm's water quality findings.
Explore water quality across Hill
Frequently asked questions
Is Mount Calm, TX tap water safe to drink?
Mount Calm's water quality earned a grade of D (47/100). Significant issues have been found. A water filter is strongly recommended. The city ranks #827 out of 1067 cities tested in Texas.
What contaminants are in Mount Calm's water?
Lead was measured at 0.0 ppb (90th percentile). 121 violations are on record.
How is Mount Calm'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 Mount Calm?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Mount Calm's water come from?
Mount Calm's water is sourced from Groundwater. The city has 2 water systems serving approximately 2,492 residents.
What health violations has Mount Calm's water system had?
Mount Calm has 51 health-based violations on record. The most recent violation was recorded in December 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 28 violations remain unresolved.
Is Mount Calm's groundwater at risk of contamination?
Mount Calm uses groundwater, which can be affected by naturally occurring contaminants like arsenic, radon, and nitrate, as well as agricultural runoff and industrial activity. The system has 121 violations on record that may relate to groundwater quality. Groundwater systems are generally less susceptible to surface contamination but should be monitored for emerging contaminants like PFAS.
How does Mount Calm's water compare to other cities?
Mount Calm ranks #827 out of 1067 cities in Texas (better than 22% of state cities) and #13736 out of 15744 cities nationally (13th percentile). The grade of D reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.