01The verdict: is King William water safe?
King William's tap water meets most EPA standards but has areas that warrant attention. With a grade of A (94.7/100), some contaminant levels or compliance issues suggest that residents may benefit from additional filtration. The city's 2 water systems serve approximately 2,323 residents using groundwater (wells).
1 unresolved violation on record
EPA records show an open compliance item 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 ↓A flood-prone service area
9 federal disaster declarations on record. After severe weather, watch for boil-water advisories.
See the risk factors ↓King William's drinking water received a grade of A (94.7 out of 100), indicating excellent water quality. The city's 2 water systems serve approximately 2,323 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 6 violations on record, including 0 health-based violations. 1 remains unresolved.
King William ranks #19 out of 229 cities in Virginia for water quality, placing it one of the best in the state. King William 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, King William may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
02What's in King William's water
Every contaminant flagged in King William, 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 Virginia
Cities ranked by compounds detected Cu Copper in Virginia
Cities ranked by 90th-percentile copper
03King William'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 6 violations on record, including 0 health-based violations. 1 remains unresolved.
All ten of the last ten years were clean — no EPA violations recorded for King William.
▼ Down 9 ppb since 1993. Latest reading: 0 ppb (2025) — 0% of the action level. Sampled at higher-risk homes (90th percentile).
04Where King William's water comes from
King William's drinking water is drawn from underground aquifers through wells.
Groundwater
Underground aquifers reached by wells — naturally filtered, but can carry minerals like arsenic and nitrate.
Local treatment
Groundwater generally needs less treatment — typically disinfection and, where needed, mineral removal.
2 systems
2 water systems, operated under local government ownership.
2,323 people
Residents served across King William's service area.
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 2,323 people through 2 water systems.
| System name | PWSID | Population | Source |
|---|---|---|---|
| CENTRAL GARAGE WATER SYSTEM | VA4101110 | 2,263 | Groundwater |
| MT. OLIVE CHURCH COMM. WELL CO | VA4101550 | 60 | Groundwater |
Water bodies near King William
These water bodies shape the regional watershed and can indirectly affect groundwater quality.
05Pressure on King William'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.
Flood & storm history
9 federal disaster declarations on record for King William County. Flooding and severe storms can overwhelm treatment plants, cause sewage overflows, and push runoff into supplies.
Drought
King William County is in D2 (severe drought) per the U.S. Drought Monitor (week of Jul 2026). Drought can raise disinfection-byproduct levels and taste/odor issues as utilities draw from lower reservoirs.
06How King William compares
Scores for nearby Virginia cities on one line, with the average marked.
dashed line = Virginia average (85/100)
King William scores 94.7/100 — above the Virginia average of 85/100. It outscores 10 of 10 nearby cities. Full Virginia rankings →
75.5 / 100AVirginia Beach City, VA
90.8 / 100ANewport News City, VA
85.6 / 100BChesterfield, VA
80.7 / 100AAshburn, VA
87 / 100AHenrico, VA
92.8 / 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 King William's water — not generic advice.
A basic carbon filter still helps
King William'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 King William 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 King William, VA tap water safe to drink?
King William's water quality earned a grade of A (94.7/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #19 out of 229 cities tested in Virginia.
What contaminants are in King William's water?
Lead was measured at 0.0 ppb (90th percentile). 6 violations are on record.
How is King William'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 King William?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does King William's water come from?
King William's water is sourced from Groundwater. The city has 2 water systems serving approximately 2,323 residents.
Is King William's groundwater at risk of contamination?
King William 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 King William's water compare to other cities?
King William ranks #19 out of 229 cities in Virginia (better than 92% of state cities) and #441 out of 15382 cities nationally (97th percentile). The grade of A reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.