Is Rocky Hill Boro-1817, NJ Tap Water Safe to Drink?
Graded A-, with 4 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
89/100
waterverge.com Rocky Hill Boro-1817, NJ — Water Quality Report
Rocky Hill Boro-1817's drinking water received a grade of A- (89 out of 100), indicating good water quality. The city's 1 water system serves approximately 687 residents using groundwater.
Lead levels were measured at 2.3 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 19 violations on record, including 0 health-based violations. 4 remain unresolved.
What to know about Rocky Hill Boro-1817's water
Rocky Hill Boro-1817 ranks #28 out of 435 cities in New Jersey for water quality, placing it one of the best in the state.
Rocky Hill Boro-1817 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, Rocky Hill Boro-1817 may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Rocky Hill Boro-1817, NJ water safe to drink?
Rocky Hill Boro-1817's drinking water has significant quality concerns based on EPA testing data. With a grade of A- (89/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 687 residents using groundwater (wells).
Recent water quality updates for Rocky Hill Boro-1817
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Rocky Hill Boro-1817's water quality assessment. Grade: A- (89/100).
Contaminants: Public Notice.
Federal disaster declaration (FEMA DR-4614). Hurricane event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-3573). Hurricane event — may have impacted local water infrastructure.
Contaminants: Revised Total Coliform Rule.
Contaminants: Chlorine.
Key contaminant findings
Based on the most recent EPA sampling data for Rocky Hill Boro-1817's water supply.
Well within EPA limits.
Violation history
Rocky Hill Boro-1817's water system has 19 total violations on record, including 0 health-based violations. 4 remain unresolved. 1 violation was issued in the last 5 years.
Flood & environmental risk
Middlesex County has experienced 10 federally declared disasters since 1992. 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 Stony Brook At Princeton, Millstone River At Carnegie Lake At Princeton, Pike Run At Belle Mead, Millstone River At Griggstown, Millstone River At Blackwells Mills.
Where does Rocky Hill Boro-1817's water come from?
Rocky Hill Boro-1817's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 687 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Stony Brook At Princeton (river), Millstone River At Carnegie Lake At Princeton (river), Pike Run At Belle Mead (river), Millstone River At Griggstown (river), Millstone River At Blackwells Mills (river).
What Rocky Hill Boro-1817 residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Rocky Hill Boro-1817'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.
Rocky Hill Boro-1817'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 droughtSomerset 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
Middlesex County has experienced 10 federally declared disasters since 1992. 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. | 2.3 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Rocky Hill Boro-1817 compares by contaminant
Explore where Rocky Hill Boro-1817 ranks among all New Jersey cities for specific contaminants.
Water source & infrastructure
Where Rocky Hill Boro-1817's water comes from
Rocky Hill Boro-1817'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 687 people through 1 water system.
Water bodies near Rocky Hill Boro-1817
Rocky Hill Boro-1817 is located near 5 notable water bodies. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Rocky Hill Boro-1817
| System Name | PWSID | Population | Source |
|---|---|---|---|
| ROCKY HILL W DEPT | NJ1817001 | 687 | GW |
How Rocky Hill Boro-1817 compares
Full New Jersey rankings →Rocky Hill Boro-1817's score of 89/100 is above the average of 63/100 among major New Jersey cities. It outscores 10 of 10 nearby cities.
Nearby cities
View New Jersey rankings →About Rocky Hill Boro-1817, NJ
Wikipedia →Monmouth Junction is an unincorporated community and census designated place (CDP) in South Brunswick, in Middlesex County, in the U.S. state of New jersey. As of the 2020 census, the CDP's population was 8,895, up 208% from its population of 2,887 in 2010.
Learn more about your water
Guides and resources related to Rocky Hill Boro-1817's water quality findings.
Explore water quality across Somerset
Frequently asked questions
Is Rocky Hill Boro-1817, NJ tap water safe to drink?
Rocky Hill Boro-1817's water quality earned a grade of A- (89/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #28 out of 435 cities tested in New Jersey.
What contaminants are in Rocky Hill Boro-1817's water?
Lead was measured at 2.3 ppb (90th percentile). 19 violations are on record.
How is Rocky Hill Boro-1817'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 Rocky Hill Boro-1817?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Rocky Hill Boro-1817's water come from?
Rocky Hill Boro-1817's water is sourced from Groundwater. The city has 1 water system serving approximately 687 residents.
Is Rocky Hill Boro-1817's groundwater at risk of contamination?
Rocky Hill Boro-1817 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 19 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 Rocky Hill Boro-1817's water compare to other cities?
Rocky Hill Boro-1817 ranks #28 out of 435 cities in New Jersey (better than 94% of state cities) and #3137 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.
Does Rocky Hill Boro-1817's small water system affect quality?
Rocky Hill Boro-1817's system serves approximately 687 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 19 violations on record.