Is Mount Baldy, CA Tap Water Safe to Drink?
Graded A, with 2 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
91.4/100
waterverge.com Mount Baldy, CA — Water Quality Report
Mount Baldy's drinking water received a grade of A (91.4 out of 100), indicating excellent water quality. The city's 1 water system serves approximately 600 residents using groundwater.
Lead levels were measured at 2.8 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 6 violations on record, including 0 health-based violations. 2 remain unresolved.
What to know about Mount Baldy's water
Mount Baldy ranks #109 out of 694 cities in California for water quality, placing it above average in the state.
Mount Baldy 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 Baldy may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Mount Baldy, CA water safe to drink?
Mount Baldy's tap water meets most EPA standards but has areas that warrant attention. With a grade of A (91.4/100), some contaminant levels or compliance issues suggest that residents may benefit from additional filtration. The city's 1 water system serves approximately 600 residents using groundwater (wells).
Recent water quality updates for Mount Baldy
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Mount Baldy's water quality assessment. Grade: A (91.4/100).
Federal disaster declaration (FEMA DR-3592). Flood event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-3591). Flood event — may have impacted local water infrastructure.
Contaminants: Lead and Copper Rule.
Contaminants: Gross Alpha, Excl. Radon and U.
Contaminants: Gross Alpha, Excl. Radon and U.
Key contaminant findings
Based on the most recent EPA sampling data for Mount Baldy's water supply.
Well within EPA limits.
Violation history
Mount Baldy's water system has 6 total violations on record, including 0 health-based violations. 2 remain unresolved.
Flood & environmental risk
San Bernardino County has experienced 10 federally declared disasters since 1980. Flooding and severe storms can overwhelm water treatment plants, cause sewage overflows, and introduce agricultural runoff, bacteria, and sediment into drinking water supplies. Local water sources include Cucamonga C Nr Upland.
Where does Mount Baldy's water come from?
Mount Baldy's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 600 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Cucamonga C Nr Upland (river).
What Mount Baldy residents can do
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 Baldy'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 droughtSan Bernardino 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
San Bernardino County has experienced 10 federally declared disasters since 1980. 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. | 2.8 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Mount Baldy compares by contaminant
Explore where Mount Baldy ranks among all California cities for specific contaminants.
Water source & infrastructure
Where Mount Baldy's water comes from
Mount Baldy'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 private ownership and serves approximately 600 people through 1 water system.
Water bodies near Mount Baldy
Mount Baldy is located near 1 notable water body. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Mount Baldy
| System Name | PWSID | Population | Source |
|---|---|---|---|
| SNOWCREST HEIGHTS IMP ASSOC | CA3600262 | 600 | GW |
How Mount Baldy compares
Full California rankings →Mount Baldy's score of 91.4/100 is above the average of 57/100 among major California cities. It outscores 9 of 10 nearby cities.
Nearby cities
View California rankings →About Mount Baldy, CA
Wikipedia →Mount Baldy or Mount Baldy Village, formerly Camp Baynham and Camp Baldy, is an unincorporated community in the San Gabriel Mountains located in San Bernardino County and Los Angeles County in Southern California, with the county line running through the community. It is located below Mount San Antonio, commonly known as "Mount Baldy", hence its name.
Learn more about your water
Guides and resources related to Mount Baldy's water quality findings.
Explore water quality across San Bernardino
Frequently asked questions
Is Mount Baldy, CA tap water safe to drink?
Mount Baldy's water quality earned a grade of A (91.4/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #109 out of 694 cities tested in California.
What contaminants are in Mount Baldy's water?
Lead was measured at 2.8 ppb (90th percentile). 6 violations are on record.
How is Mount Baldy'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 Baldy?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Mount Baldy's water come from?
Mount Baldy's water is sourced from Groundwater. The city has 1 water system serving approximately 600 residents.
Is Mount Baldy's groundwater at risk of contamination?
Mount Baldy 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 6 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 Baldy's water compare to other cities?
Mount Baldy ranks #109 out of 694 cities in California (better than 84% of state cities) and #1736 out of 15744 cities nationally (89th percentile). The grade of A reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Mount Baldy's small water system affect quality?
Mount Baldy's system serves approximately 600 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 6 violations on record.