Is Lockeford, CA Tap Water Safe to Drink?
Graded A-, with 10 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
88.9/100
waterverge.com Lockeford, CA — Water Quality Report
Lockeford's drinking water received a grade of A- (88.9 out of 100), indicating good water quality. The city's 3 water systems serve approximately 3,930 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 27 violations on record, including 9 health-based violations. 10 remain unresolved.
What to know about Lockeford's water
Lockeford ranks #175 out of 694 cities in California for water quality, placing it mid-range in the state.
Lockeford 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.
Water quality score
See methodology →Is Lockeford, CA water safe to drink?
Lockeford's drinking water has significant quality concerns based on EPA testing data. With a grade of A- (88.9/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 3 water systems serve approximately 3,930 residents using groundwater (wells).
Recent water quality updates for Lockeford
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Lockeford's water quality assessment. Grade: A- (88.9/100).
Federal disaster declaration (FEMA DR-3592). Flood event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-4683). Flood event — may have impacted local water infrastructure.
Contaminants: Consumer Confidence Rule.
1 health-based. Contaminants: Coliform (TCR).
Contaminants: Consumer Confidence Rule.
Key contaminant findings
Based on the most recent EPA sampling data for Lockeford's water supply.
Well within EPA limits.
Violation history
Lockeford's water system has 27 total violations on record, including 9 health-based violations. 10 remain unresolved.
Flood & environmental risk
San Joaquin 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 Dry C Nr Galt.
Where does Lockeford's water come from?
Lockeford's drinking water comes from groundwater (wells), supplied by 3 water systems serving approximately 3,930 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Dry C Nr Galt (river).
What Lockeford residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Lockeford'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.
Lockeford'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
Top industrial polluters within 10 miles of Lockeford
Industrial polluters nearby
Reported releases to surface water by facilities near Lockeford, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
JENSEN PRECAST LOCKEFORD, CA95237 | — | — | 0.8 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Flood & disaster history
San Joaquin 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. | 0.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Lockeford compares by contaminant
Explore where Lockeford ranks among all California cities for specific contaminants.
Water source & infrastructure
Where Lockeford's water comes from
Lockeford'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 3,930 people through 3 water systems.
Water bodies near Lockeford
Lockeford is located near 1 notable water body. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Lockeford
| System Name | PWSID | Population | Source |
|---|---|---|---|
| LOCKEFORD COMMUNITY SERV. DIST. | CA3910008 | 3,572 | GW |
| DOUBLE L MOBILE ESTATES | CA3900842 | 320 | GW |
| HANOT FOUNDATION INC | CA3901276 | 38 | GW |
How Lockeford compares
Full California rankings →Lockeford's score of 88.9/100 is above the average of 57/100 among major California cities. It outscores 8 of 10 nearby cities.
Nearby cities
View California rankings →About Lockeford, CA
Learn more about your water
Guides and resources related to Lockeford's water quality findings.
Explore water quality across San Joaquin
Frequently asked questions
Is Lockeford, CA tap water safe to drink?
Lockeford's water quality earned a grade of A- (88.9/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #175 out of 694 cities tested in California.
What contaminants are in Lockeford's water?
Lead was measured at 0.0 ppb (90th percentile). 27 violations are on record.
How is Lockeford'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 Lockeford?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Lockeford's water come from?
Lockeford's water is sourced from Groundwater. The city has 3 water systems serving approximately 3,930 residents.
What health violations has Lockeford's water system had?
Lockeford has 9 health-based violations on record. The most recent violation was recorded in July 2016. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 10 violations remain unresolved.
Is Lockeford's groundwater at risk of contamination?
Lockeford 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 27 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 Lockeford's water compare to other cities?
Lockeford ranks #175 out of 694 cities in California (better than 75% of state cities) and #3164 out of 15744 cities nationally (80th percentile). The grade of A- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.